Which of the following pairs work together to form the neuroendocrine
system?
o
a. amino acids and neurons
o
b. hormones and proteins
o
c. neurons and nerve impulses
o
d. neurotransmitters and hormones

D

Explanation:

The neuroendocrine system is made up of the cell in the body that ‘sit’ between the nervous system and the endocrine system. These cells are like the pituitary gland, islets cells of the pancreas, thyroids, and etcetera. They receive nerve impulses  from nerves connected to them. The impulse then triggers them to release respective hormones into the blood.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.