During the development of human offspring, which of the following begins to hear and see?

The correct answer is Hear. During the development of human offspring, the sense of "hearing" comes first before the sense of sight. Sight is the least developed sense at birth. Babies can detect sounds by the third trimester. So more or less, this send is already advance for him at birth.

Crossing over creates new combinations of genes in the gametes that are not found in either parent contributing to genetic diversity

The correct answer to this question would be c