What is one biotic factor that can change the size of a population in an ecosystem?

a) the type of soil present

b) the number of predators present

c) the average yearly temperature

d) the amount of available groundwater

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.