Which of the following is the best example of a pioneer species?
a. lichens growing on rocks after a volcanic eruption
b. grasses growing after a forest fire
c. oak trees replacing pine trees in a forest
d. small mammals moving into a grassland

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

There is a liquid capsule inside a cup full of liquid. the cup full of liquid has salt in it and the liquid capsule has no salt in it. in which direction will the solvent flow? a. the salt does not have to move b. from the capsule to the larger cup c. equally between the capsule and the cup d. from the larger cup to the capsule

What happens when two nitrogen atoms share electrons