The solute concentration of the body fluids of a shark is dose to that of seawater. The shark achieves this by retaining high levels of urea in its body What is the benefit of such a mechanism?
A. It prevents the gain of salts from the surrounding sea by osmosis
B. It prevents the gain of water from the surrounding sea by Osmosis
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C. It prevents the loss of water to the surrounding sea by osmosis
D. It prevents the loss of salts to the surrounding sea by osmosis

What best explains the inability for life to exist in earth early atmosphere

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred