The secretion of neurotransmitters out of the nerve cell from small vesicles at the end of the axon can be considered an example of

The cluster of developing cells from conception until birth is called an

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

Which type of neuron stimulates muscles to contract?