•Variation. Organisms (within populations) exhibit individual variation in appearance and behavior. ...
•Inheritance. Some traits are consistently passed on from parent to offspring. ...
•High rate of population growth. ...
•Differential survival and reproduction
Answer:
reproduction, heredity, variation in fitness or organisms
Explanation:
Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
