The ability of a postsynaptic cell to respond to a neurotransmitter depends on: a. presence of ligand-gated ion channel receptors on the postsynaptic cell. b. All of these choices are correct. c. release of neurotransmitter from the presynaptic cell. d. an action potential in the presynaptic cell.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.