1. resources for survival and reproduction are limited A. variation

B. competition

C. time

D. inheritance

E. differential reproduction

2. individuals in a population have different phenotypes

A. variation

B. competition

C. time

D. inheritance

E. differential reproduction

3. some individuals in a population reproduce more than others

A. variation

B. competition

C. time

D. inheritance

E. differential reproduction

4. parents pass on their traits to their offspring

A. variation

B. competition

C. time

D. inheritance

E. differential reproduction

5. successful variations accumulate over many generations

A. variation

B. competition

C. time

D. inheritance

E. differential reproduction