The first organisms to break down rocks are mosses and lichens. True or False.
Pine trees, maple trees, and palm trees are the first trees to appear in primary succession. True or false.

Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .

Acell in the human nervous system whose primary function is to form myelin and the blood-brain barrier, respond to injury, remove debris, and enhance learning and memory is called a(n) cell.

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian