Primary succession

a. is caused solely by human events
b. occurs on preexisting soil
c. occurs in areas without soil
d. becomes normalized by climax species

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

True or false multiple lane changes must be done individually going through the same procedures for each lane change