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mihalych1998 [28]
3 years ago
12

Water fleas (Cladocera) are small freshwater crustaceans. They are filter feeders can are about 3-5mm long. The outer carapace o

f a water flea is transparent so the internal organs can be observed. Caffeine raises the heart rate of humans. Hanna predicts caffeine will have the same effect on other organisms. She uses the water flea as her test subject in an experiment. Hanna introduces varying amounts of caffeine to water flea populations. Using a microscope, she measures the heart rate in beats per second of sample water fleas. She records the data in a table. As the concentration of caffeine increases, Hanna observes the water flea heart rate also increases. What is the hypothesis in Hanna’s experiment? A) Caffeine raises the heart rate of humans. B) Water fleas prefer caffeine over plain water. C) Caffeine increase the heart rate of the water flea. Eliminate D) The effects of caffeine are the same on all organisms.
Biology
1 answer:
quester [9]3 years ago
3 0

Answer:

The Answer is C.

Explanation:

sorry i took awhile

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Which of the following chemical reactions proves the fact that the products of photosynthesis are reactants of respiration?
Dmitry [639]

i have no clue that is my anser

6 0
3 years ago
Dan and Fiona have decided to utilize technology to overcome their infertility problems. They opt for a procedure in which a mat
Afina-wow [57]

Answer:

This technique is called in-vitro fertilization.

Explanation:

In-vitro fertilization (IVF) refers to a form of assisted-reproduction technology in which the encounter of male and female gametes takes place outside the female organism (such as a human patient, in this case). IVF may be employed in several situations, including:

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3 0
3 years ago
1) Can anyone say any sources of Natural fibres <br> 2) What are some uses of Natural fibres
horsena [70]

Answer:

1) Natural fibers come from many sources. These sources can include plants, animals, and minerals. We are probably most familiar with plant and animal fibers from a consumer standpoint. Common natural fibers sourced from the plant kingdom include cotton, flax, hemp, bamboo, sisal, and jute

2) Benefits of a high-fiber diet

Normalizes bowel movements. Dietary fiber increases the weight and size of your stool and softens it. ...

Helps maintain bowel health. ...

Lowers cholesterol levels. ...

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5 0
2 years ago
Read 2 more answers
Simple epithelia have more layers for protection, whereas stratified epithelia allow materials to move across them and are less
xeze [42]

Answer: False.

Explanation:

Epithelial tissue is found in the linings of many structures throughout the body. There are two kinds of epithelial tissue: simple and stratified. And they  perform different functions and are structured differently.

The simple epithelium consists of one single layer of cells. In this way, all cells are in direct contact with the basement membrane and are separated from the connective tissue. The main function of this epithelium is <u>absorption and filtration.</u>

The stratified epithelium is composed of many layers of cells that are stacked together. In this way, this epithelium has the function of <u>protecting against physical and chemical damage.</u>

7 0
3 years ago
Darwin thought that significant evolution was much too slow to be witnessed in a human lifetime. recent experiments by biologist
Ede4ka [16]

Significant evolution, in Darwin's opinion, moves much too slowly to be seen in a person's lifetime. Recent biological tests have demonstrated that some populations may develop extremely quickly, with significant changes happening over many generations in the lab.

What role does Darwin's theory of evolution play?

  • Charles Darwin, a scientist of the 19th century, investigated the idea of natural selection. Natural selection provides an explanation for how a species' genetic features might evolve through time. This might result in speciation, or the creation of a new, separate species.
  • The genesis and adaptations of species entered the scientific canon with Darwin's finding of natural selection. The adaptive characteristics of creatures might now be explained by natural processes, much as the occurrences of the inanimate universe, without the need for an Intelligent Designer.

Learn more about Darwin here:

brainly.com/question/14353066

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6 0
1 year ago
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