Lets see this with example
if you put a red blood cell in a glass of water the red blood cell is in hypotonic solution and that water flows into less concentrated area ( in to the red blood cell ) which eventually will swell and burst.
Another plot is when we put the same red blood cell in a glass full of salty solution which is Heterogeneous solution. In these case the water will move out from the cell to the solution which cause the cell to shrink.
This could either be c or d, both should work
According to the top down control, each trophic level is controlled by the very next trophic level. It says that predators control the population of prey.
Therefor the correct answer is D
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