Fill out the blank. 1. Fossils and __________ are used to determine the differences between organisms.

2. All of Earth’s fossils organized by age is the _______________.
3. The idea that some animals are better equipped than others to survive in their environment than other is the basis of _____________________.
4. Scientific claims should be supported by facts and ____________.
5. Fish, amphibians, birds, reptiles, and mammals all have backbones, which means they are ________________.

1 answer

1. DNA or genetic data
2. fossil record
3. natural selection
4. evidence
5. vertebrates
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