Question

what is one way scientists know that maiacetus lived in the ocean? they just guessed. they found the bones near fossils of other sea creatures they are swimming in the ocean right now. they discovered that they have the genes that allow them to breathe underwater

Explanation:

Scientists use fossil - evidence. Finding Maiaecetus bones near other sea - creature fossils implies it lived in the ocean. Guessing is not scientific. Maiaecetus is extinct so it's not swimming now. There is no evidence of underwater - breathing genes.

Answer:

They found the bones near fossils of other sea creatures