Across
- 3. characteristics that could be passed onto offspring
- 4. ___________ is the record of the fossils in lower and upper layers
- 8. how something becomes better developed and stronger
- 10. overproduction of offspring
- 11. variations include mutations and genetic recombination
- 12. what happens when glucose is broken down to get energy
- 14. what happens to species during short periods of rapid change
- 15. suggests common ancestry
Down
- 1. 3 things that are similar in all living organisms
- 2. When individuals with high fitness are better than those with low fitness
- 5. present species developed from earlier, distincly different species
- 6. A change in the genetic material of a cell
- 7. 2 parts to this theory
- 9. explains a wide range of observations
- 13. when there is a limited supply of resources