The cortical reaction. It is initiated during fertilization by the release of cortical granules from the egg, which prevents multiple sperm with one egg.
Dark blue I am pretty sure
If vegatation were to decrease then primary consumers that are herbivores which are usually the prey will start to decrease too, because there food source is becoming limited. It's like a domino effect, if something is unbalanced in the ecosystem then the whole ecosystem could collapse.
I believe it was just called "the rule of law"
C. Bacteria do not have a nucleus and instead have strands of DNA that are loose in the cell