The amygdala consists of emotion-linked neural clusters in the

Medial temporal lobe of brain

Explanation:

It is a main part of limbic system and process emotions. It is a cluster of neurons called as basolateral complex that are specialized for emotion processing.

the answer is "a.) well–developed vascular system."

explanation:

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.