Question

Mammary glands in whales and humans: a. are a synapomorphy for these species and other mammals b. are homologous traits c. were likely present in the most recent common ancestor of humans and whales d. all are correct?

1) are a synapomorphy for these species and other mammals
2) are homologous traits
3) were likely present in the most recent common ancestor of humans and whales
4) all are correct

Answer 1

The mammary glands in whales and humans are a synapomorphy, homologous traits, and were likely present in their most recent common ancestor. Option number 4 is correct.

Step-by-step explanation:

The correct answer is d. all are correct.

Mammary glands in whales and humans are a synapomorphy for these species and other mammals, meaning it is a shared derived characteristic that evolved in their common ancestor and is unique to them and other mammals.

The mammary glands in whales and humans are also homologous traits, which means they have a similar origin and anatomical structure, despite the differences in their function and appearance.

Furthermore, it is likely that mammary glands were present in the most recent common ancestor of humans and whales, as they are a defining characteristic of mammals.