What is the protozoan and who is the first to observe one?

Answers

Answer 1

Answer:

Protozoa is an informal term for a group of single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris. Anton van Leeuwenhoek was the first person to see protozoa, using microscopes he constructed with simple lenses. Between 1674 and 1716, he described, in addition to free-living protozoa, several parasitic species from animals, and Giardia lamblia from his own stools.


Related Questions

Why must a forensic anthropologist be able to distinguish between antemortem and perimortem pathology

Answers

Answer: Antemortem describes injuries or pathologies inflicted on the victim before the death. Perimortem refers to any injury associated with the manner of death.

Explanation:

A foresen anthropologist is a person who is dedicated to identifying and studying skeletonized human remains and trying to determine markings on the bones that can elucidate the causes of death. In this way, the anthropologist seeks to learn about the events that occurred by studying the injuries and analyzing evidence left at the scene.

The term antemortem is used to describe injuries or pathologies on the victim before his or her death, which, however, have not caused the person's death. On the other hand, the term perimortem refers to injuries or pathologies associated with the manner of death. That is, it is necessary to distinguish between the two to determine the cause of death of the person. Not only has an antemortem injury or pathology not led to death, but it has no relationship to the event. And a perimortem injury or pathology is fatal, it must be focused on in order to clarify the facts and know how the person died.

Confusing an antemortem pathology with a perimortem one or vice versa, can lead to an erroneous diagnosis of the cause of death.

What are photosynthesis’s main inputs and outputs of matter and energy?

Answers

Photosynthesis’s inputs would be energy in the form of sunlight, water, and carbon dioxide. The outputs are glucose, which the plant uses for energy, and oxygen

Laboratory techniques for randomly linking together amino acids typically generate an insoluble polypeptide, yet a naturally occurring polypeptide of the same length is usually soluble. Explain.

Answers

Answer:

The answer has been explained below

Explanation:

The polypeptide has a natural selection due to an optimized sequence. It folds properly. At the outside it has hydrophobic residues. Inside it has polar residues. Now the random sequence of the synthetic peptide is going to be unable to give a good direction to a folding process. This will cause aggregation of hydrophobic side chains on various molecules. Bringing about the polypeptides precipitation from solution. Polypeptides that occur naturally have have the same length when they are in aqueous solution because of amino acid side chains that are present and are large with reactive functional groups.

Which statement is true of the many parts of the biosphere?* O A. Each part includes salt water. O B. Each part is completely unique. O c. Each part is isolated from the others. O D. Each part is connected to all the others.​

Answers

Answer:

The answer is D Each part is connected to all the others

Explanation:

While each part is different they interact with eachother to exchange matter and make life possible :) Hope this helps!

The true statement among the given options of the many parts of the biosphere is option D. Each part is connected to all the others.​

The biosphere is the ecosphere consist of air, land, water, and rocks all parts where life is found or possible. It is made up of parts of all ecosystems where life exists on earth.

The biosphere has three major parts that interact with one another where life is found:

The lithosphere - the outermost layer of the crust of the earth,The hydrosphere - all the water bodies, ponds. ocean, rivers, and lakes,The atmosphere - includes gases and the air of the earth.

All these parts are interconnected with other parts of the biosphere there are no isolated parts.

Thus, the correct answer is - D. Each part is connected to all the others.​

Learn more about the biosphere:

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What is the layer of myelin that surrounds an axon called?

Group of answer choices

1. Node of Ranvier
2. Perichondrium
3. Perimysium
4. Myelin sheath
5. Periosteum

Answers

The gaps (approximately 1 micrometer wide) formed between myelin sheath cells long the axons are called Nodes of Ranvier. Since fat serves as a good insulator, the myelin sheaths speed the rate of transmission of an electrical impulse along the axon.

I think the answer is Nodes of Ranvier but I’m not sure. I hope this helped <3

what kind of document is the undelivered speech of benigno aquino jr​

Answers

Answer:

Manuscript Speech.

Explanation:

The undelivered speech of Benigno Acquino Jr was the speech concerning 'Ninoy' arrival from the US on 21 Aug, 1983. The speech, as the name suggests was undelivered because as soon as Acquino stepped on the airport, he was shot dead with a bullet straight in the center of his head.

This document is called manuscript speech. A Manuscript speech is the one that is written text which is to be read to the audience. Such speech require to be read word-by-word as written in the document.

Therefore, the correct answer is manuscript speech.

CAN SOMEONE PLEASE HELP ME WITH THIS SCIENCE QUESTION THANK YOU!!

Answers

C.
They live in an unstable environment

When pushing off the wall doing breaststroke, swimmers must do a/an __________pull?

Answers

Answer:

i started swimming this year its pretty fun : ) I believe the answer to your question would be a pull down/breakstroke pull

Explanation:

I hope this helps your welcome..

Pull-downs are essential to a fast breaststroke race. Without a good pull-down, you have a major disadvantage. You don’t want to start the race behind your opponents! If you’re looking to improve your breaststroke time, mastering the pull-down is a great way to do it. This guide is filled with easy steps to strengthen your race through a powerful pull-down.


2. What types of molecules are used for energy?
3. What is most commonly used?
(U.S.)

Answers

Answer:

Explanation:

Biological molecules The food we eat – our diet – is made up of different biological molecules which give us energy and contain chemicals we need to grow and repair ourselves and help our cells function in our body.

-4. Which of the following correctly traces the path of air after it is inhaled?
A. epiglottis, trachea, bronchioles, alveoli
B. bronchioles, alveoli, epiglottis, trachea
C. epiglottis, bronchioles, alveoli, trachea
D. alveoli, epiglottis, trachea, bronchioles

Answers

The answer is c. Epiglottis, bro chilies, alveoli, trachea

Which of the following diseases causes dogs to have a chronic cough?

Answers

Answer:

What are the following diseases?

Explanation:

What are the following diseases?

You didn’t write down the following diseases

Many male birds will expend a great deal of energy building nests. Females will mate with the males who build the best nests. This is best described as an example of ____.
a. ​natural selection
b. ​sexual selection
c. ​runaway selection
d. ​an invasive species
e. ​disruptive selection

Answers

Answer:

The correct answer is option B.  sexual selection.

Explanation:

Sexual selection is a special type of natural selection proposed by Charles  Darwin. According to this type of natural selection in which a particular sex organism chooses the opposite sex member of the species to mate with on the basis of the preferable traits and compete with the other members of the opposite sex.

Here female birds choose those male birds who build the best nests, it is an example of natural selection.

Which option gives two examples of clastic sedimentary rock? a. coquina and shale b. limestone and sandstone c. coquina and limestone d. shale and sandstone

Answers

I believe the answer is Shale and Sandstone.

Answer:

It is d. Shale and Sandstone

Explanation:

Because two examples of clastic sedimentary rock are Shale and Sandstone "I know because I love science"

the ends of the dna chains are made up of several repeating nucleotides that do not function in genetic instruction or as genes. These end nucleotides are called ____

A. Telomeres

B. Histones

C. Chromatids

D. Centromeres

Answers

I’m pretty sure it’s D because when I was in biology I never heard of the rest of the choices

Pedigree D is most likely X-linked dominant. What is/are the genotype(s) of the parent(s) that transmitted the mutant allele(s) to their offspring

Answers

Answer and Explanation:

Note: In the attached file you will find the pedigree and the genotypes of each member.

Parentals)  XDXd    x     XdY

The female is heterozygous for the trait, transmitting the mutant allele The male is not affected.

According to the pedigree, they had the following progeny:

XdXd healthy femaleXdY healthy maleXDXd affected female (this individual transmitted the mutant allele)XDY affected male (this individual transmitted the mutant allele)

-Both healthy individuals mated with another two healthy individuals. Their whole progeny was healthy.

-The affected female (XDXd) mated with a healthy male (XdY), and they produced 100% healthy individuals

-The affected male (XDY) mated with a healthy female (XdXd) and they had three affected females, XDXd.

Why should muscles not be dissected at the points of origin and insertion

Answers

Answer:

The muscles should not be dissected at the points of origin and insertion due to the fact that the cell structures present here are a typical in nature .

Explanation:

The origin is where the muscle joins the stationary bone. The insertion is where it joins the moving bone. ... At the bone, the fibres of the tendon are embedded in the periosteum of the bone. This anchors the tendon strongly and spreads the force of the contraction, so the tendon won't tear away easily.

When the isotonic saline solution described in part A is connected to an unknown solution via a semipermeable membrane, the unknown solution level drops. Based on this information, what can be said about these two solutions?

Answers

Answer:

The new solution has a higher concentration than the isotonic saline solution

Explanation:

Here, we want to deduce what has happened in the question.

We are told that the level of the isotonic saline solution dropped because it was connected an unknown solution using a semipermeable membrane.

Since the level of the solution dropped, then it must have occurred that there has been the loss of some of the molecules of the solution.

What has occurred is the process of Osmosis

Osmosis simply involves a movement through a semipermeable membrane of solvent molecules due to the fact that the previous solution is of lower concentration than the present one.

So what we can see here is that there has been a movement due to osmosis as a result of the fact that the new solution has a higher concentration than the former one

why do we need to study, talk and explore the Male and Female Sexual Anatomy

Answers

We study sexual anatomy to better understand the process of reproduction in humans. It also can help us better understand how a majority of animals reproduce, and how it can influence ecosystems. I hope this helps, and please mark as Brainliest answer!!

In which phases is chromatin condensed?

Answers

Answer:

In stage 2

Explanation:

During interphase (1), chromatin is in its least condensed state and appears loosely distributed throughout the nucleus. Chromatin condensation begins during prophase (2) and chromosomes become visible. Chromosomes remain condensed throughout the various stages of mitosis (2-5).

What organelle is attached to the Rough ER

Answers

Answer:

Ribosomes

Explanation:

Answer:

The ribosomes.

Explanation:


Find, in km/h, the rate at which a car travels if it
goes 38.5km in 35 min.​

Answers

Use this to help you. So here velocity is not given… so we have to calculate velocity of the car from given data. Car travel 60 km in 35 minutes. Frist of all we have to convert 35 minutes in hours by deviding 35 to 60 hour = 35/60

Next we have to calculate distance in kilometres so distance =velocity ×time.

Velocity =distance / time

Velocity =60/(35/60)

Velocity=3600/35

Distance = velocity ×time

In one hour… it will travel…

Distance =(3600/35) ×1.

By dividing you will get the answer…hope it will

Identify the structure labeled B

A. Nucleotide
B. Base
C. Phosphate
D. Sugar

Answers

The answer is A. Nucleotide


Question 1(Multiple Choice Worth 3 points)
(03.02 LC)
The average weather pattern of a region over a long period of time is known as
O weather
O climate
O elevation
O conditions

Answers

The long period of time over a region is called climate

Answer:

Its b

Explanation:

DNA replication results in two DNA molecules,

Answers

DNA replication results in two DNA molecules,
each with one new strand and one original strands.

Hope this helps!

What are the consequences of uncontrolled sexuality?

Answers

You may Struggle with feelings of guilt, shame and low self-esteem. Develop other mental health conditions, such as depression severe distress and anxiety.

Sensory System Knowledge Check
1. Which two senses are forms of chemoreception?

Answers

Answer:

taste and smell

Explanation:

there is ALSO more not only 2

Answer:

The senses and taste

Explanation:

HELPP PLEASE!!

What is a subjective claim?
A claim based in personal opinion.
A claim that covers two subjects or topics.
A claim based on verifiable fact.

Answers

Answer:

A

Explanation:

its a expression of belief, opinion, or personal preference

Why do animal population decrease between July and December

Answers

Because it gets colder and some animals can’t survive the conditions, food is sparse, and some animals of that population migrate so it’s considered that “less animals are there.”

Carbohydrates are a type of biological macromolecule required to carry out life functions. Which of the following is NOT true regarding carbohydrates?

A. Monomers of starch are sugars such as glucose.

B. Living things store extra sugars as complex carbohydrates.

C. They contain carbon, hydrogen and oxygen, usually in the ratio of 1:2:1.

D. Carbohydrates are the main component that makes up cell membranes

Answers

Answer:

D. Carbohydrates are the main component that makes up cell membranes

Explanation:

The main component of the cell membrane is a double layer of phospholipids - molecules with a phosphate head and fatty acid tail. Therefore D is incorrect. There are some carbohydrates in the cell membrane, but they are not the main component.

The statement 'carbohydrates are the main component that makes up cell membranes' is NOT true (Option D).

Carbohydrates are biopolymers composed of monosaccharide units linked by glycosidic bonds.

Complex carbohydrates (e.g., starch) consist of large branched or unbranched chains of monosaccharides, while simple carbohydrates (e.g., glucose) are monosaccharides.

Complex carbohydrates serve as sources of longer energy storage for the cells, while monosaccharides provide energy quickly.

The main component of the cell membranes are lipids (i.e., phospholipids and cholesterol).

In conclusion, the statement 'carbohydrates are the main component that makes up cell membranes' is NOT true (Option D).

Learn more in:

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help plz i will do anything

Answers

Answer:

B

Explanation:

Inertia is the tendency of an object to resist changes in its state of motion and it varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has.

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