Which of the following is NOT evidence that whales and dolphins changed over time and once lived on land? a. They have lungs
b. They have arm bones that look like those bones of land qwelling organisms.
c. They have small hairs.
d. They do not have hair.

Am not so sure but I think that your ans is a

D.

Explanation:

Because that's what every mammal has that lives on land. (Whales and dolphins are mammals)

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be