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FinnZ [79.3K]
2 years ago
5

When doing medical research with human subjects, which four limitations are unavoidable?

Biology
1 answer:
mojhsa [17]2 years ago
5 0

It's often impossible to repeat trials on the same subjects. 2-Subjects may report an inaccurate medical history. 3-It can be difficult to control all possible variables. 4-It's impossible to come up with testable scientific questions for human subjects.

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vovangra [49]
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2. The correct answer cells in the fish will stay the same size. This will occur because both solutions, freshwater lake and river have similar (or equal) solute concentrations. Those solutions are called isosmotic. There is no movement of water or the solutes, so the cell stays the same.</span>

3. The correct answer is to swell. <span>This will happen because sea star egg has the same solute concentration as its first environment-ocean meaning that this solution is hyperosmotic comparing to the lake (ocean is saltier than the lake, it has more solutes). When you put the sea star egg in the lake, the water from the lake will move (via osmosis) into the egg, to reach equilibrium. Water will cause the cell to swell.</span>
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3 years ago
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slamgirl [31]

A balance is best used to measure a sample's mass.

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Marianna [84]

The answer is A or the first one

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