How much of earth's atmosphere is made up of nitrogen and oxygen? a. between 25 and 75 percent b. 100 percent c. less than 1 percent d. close to 99 percent

Explain in your own words what caused pangea to separate and why we don't worry about earthquakes in florida.

Which would stop hardy-weinberg equilibrium from happening?

Which of the following statements is a scientific claim? a. the early solar system had large amounts of water; so, the oldest objects in the solar system should also be abundant in water. b. earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea. c. the mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency. d. planet earth is abundant in water, but there is no way to scientifically determine from where earth's water originated.