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butalik [34]
3 years ago
11

Why fresh water protozoa bear contractile vacuole?

Biology
1 answer:
Lerok [7]3 years ago
4 0

Answer:

It lacks a wall thus use the contractile vacuole to collect and expel excess water from the cell.

Explanation:

  • The contractile vacuole regulates the quantity of water inside a cell through a process known as osmoregulation.Osmosis constantly drives water in the cell since it is enclosed by a semipermeable membrane that can not keep the water out thus it is needed to prevent rupturing of the cell due to excess water in the cell.
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Question 3 (1 point)
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Steve would need to gather other scientists who have come to the same conclusion and introduce those claims to government officials.

<h3>Policy for Science</h3>

Policy for science can be arrived at when scientists pitch the outcomes of their findings to the government. especially if the findings affect the country or its people at large.

As a conservation biologist, Steve will need to work hand in hand with other scientists in the same field. Together, they can then present their findings to the government and advise the government accordingly.

More on policy for science can be found here: brainly.com/question/12720690

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2 years ago
how would you use the scientific method to answer this question: do mice live longer when they are fed high-sugar diets
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Answer:

The question: Do mice live longer when they are fed high sugar diets?

Hypothesis: There are two hypothesis the null hypothesis which we assume is correct, it states that a high sugar diet will have no effect on the life span of a mouse and an alternate hypothesis that we accept if evidence shows that sugar does increase the life span if mice. It says a high sugar diet does incerease the life span of mice.

Prediction: Assume that the null hypothesis is correct. High sugar diets will not increase the life span of the mice.

Collect data through experimentation. Use some mice as a 'control'. These mice will not undergo any changes but will be kept for comparison. Expose some other mice to high sugar diets and the compare the outcome with the 'control' mice.  

Analyzing: From the experiment this you can choose which hypothesis you are going to accept. I.e. null: no change or alternate: there was a change and do some extra research to back up your hypothesis.

Hope this helps :)

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