How plate tectonics have changed the earth’s surface over time

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart