Aclass of chemicals called neurotransmitters is important in the transmission of nerve impulses. neurotransmitters are packaged by the cell into small, membrane-bound sacs called vesicles. upon receiving a chemical signal, the vesicles move towards the cell membrane and fuse with it, releasing the enclosed neurotransmitters from the terminal end of the nerve cell. which organelle is most likely responsible for packaging neurotransmitters into a vesicle?

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

Ture or false evidence for evolution includes millions of fossils

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.