Which checkpoint makes sure that the cell has appropriate growth before the DNA replicated accurately

How was the climate when the ambulocetus was alive

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

How do cells grow and reproduce to maintain homeostasis?