Question

Darwin realized that ____ variation ________________ must be the starting point for change in nature. In any generation, the animals in a litter are never quite the same. And in the wild, such a tiny ____ ___________ might make all the difference between life and death.

Answer 1

Refer below.

Step-by-step explanation:

Darwin realized that variation must be the starting point for change in nature. In any generation, the animals in a litter are never quite the same. And in the wild, such a tiny variation might make all the difference between life and death.

Answer 2

Answer:Darwin realized that existing heritable variation in a generation must be the starting point for a change in nature. In any generation, the animals in the litter are never quiet the same. And in the wild,such a tiny heritable variation might make all the difference between life and death.

Step-by-step explanation: