Question

in the earliest stages of development the embryos of a fish, calf, human, and tortoise all look similar. in the next stage the fish looks the most different. what assumption can be made based on this different? a the fish is not related to any of the other organisms.. b the calf, human and tortoise are more closely related to one another than the fish. c of the four organisms, the fish and human are least related. d of the four organisms, the fish and human are most closely related.

Explanation:

Embryonic similarity in early stages indicates shared ancestry. The fish diverges earliest, meaning the calf, human, and tortoise retain more shared developmental traits, so they are more closely related to each other than to the fish. Option A is wrong (all share early similarity, so related); C is unsupported (no data on fish-human vs fish-tortoise); D is opposite of observation.

Answer:

B. The calf, human and tortoise are more closely related to one another than the fish.