Answer:Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
Explanation: I hope you understand!
2. True
3. True
4. Because they will ensure valid conclusions regarding the safety of the dam
5. Revise the hypothesis and try again
6. Ask a question
7. Revise your hypothesis and try again
8. After they have drawn a conclusion and analyzed results
9. In order to test their hypothesis
10. True
Your answer would be A. The earth element stays in the same area of the lithosphere, hydrosphere, or atmosphere where they originated when the earth was formed.
let me do my research real fast and I will let you know what I find
