. 1. evolution, changes
2. evidence, fossil
3. Natural selection
4. common ancestor, descend
5. similarities, organisms
1. is the gradual process by which an organism over time. 2. Scientists use from the record to help them explain how living things evolve.3. is a key mechanism of evolution. 4. Scientists believe that humans share a with other primates like chimpanzees, but they did not from them.5. Scientists determine evolutionary relationships between organisms by studying in how develop
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