Spider adaptations. Plzz need help

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

Is dna the same in every cell in the human body explain your answer