20 points + and give brainiest answer! explain the difference between ionic compounds and covalently bonded compounds.

In a certain ecosystem owls are predators for mice. the owl population increases and they eat more mice this causes the mouse population to decrease what happens next? a. the birth of mice increases. b. the birth rate of owls increases c. the population of owls decreases d. the population of mice increases

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins