An organism's ability to reproduce a significant number of fertile and healthy progeny is known as:

How does genetic variation among individuals of the same species help them avoid species extinction?

Human appendix and wings in flightless birds are examples of  _________.

Which of the following is in accordance with the theory of evolution by natural selection?

All of the following are pieces of evidence of evolution by natural selection except:

The forelimbs of frogs, birds, rabbits, and lizards look very different, but they share a common ancestor and are made up of common bones. These traits are ______.

What is the concrete evidence that humans and chimpanzees share a relatively common ancestor?