There are several factors that lead to genetic variation in organisms. Which of the following is NOT one of those factors?

Does all the energy stored by the phytoplankton reach the top level of the pyramid

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.

Serve the lifecycle of an insect called the rhino beetle as a group what are the two stages between the egg stage and the pupa stage called