C. must be controlled to coordinate with the cell cycle
Hope this helps :)
Commensalism because the birds is benefiting but the tree is not harmed
it is a variable (often denoted by x ) whose variation does not depend on that of another.
You didn't give the options for "which" but I assume your multiple choice questions will all be environmental factors that can cause mutations. To pass on to offspring, any mutation in the gametes or a chromosome may cause a mutation in the offspring.
Burning fossil fuels create:
Energy and carbon dioxide
