The concentration of solutes in a red blood cell is about 2%. Sucrose cannot pass through the membrane, but water and urea can. Osmosis would cause red blood cells to shrink the most when immersed in which of the following solutions? Why?
(a) pure water(b) a hypertonic urea solution(c) a hypotonic sucrose solution(d) a hypertonic sucrose solution

D: a Hypertonic sucrose solution

Explanation:

Sucrose cannot pass through the membrane and Hypertonic solution's cause cells to shrink.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

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