Natural Selection

2. having died out completely and no longer alive anywhere on Earth
4. an animal that hunts and kills other animals for food
7. a way of hiding by looking the same as the background
13. a trait that makes it less likely that an individual will survive in a specific environment
14. to stay alive
17. a characteristic that all members of a species have
18. a graph that uses bars to show how characteristics or values are distributed within a group
19. a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group
21. a type of molecule that genes and chromosomes are made of
22. selection: the process by which the distribution of traits in a population changes over many generations
23. any difference in traits between individual organisms
24. a group of the same type of organism living in the same area

1. the number of individuals with each trait in a population
3. a specific characteristic of an individual organism
5. living things, such as plants, animals, and bacteria
6. to receive genes from a parent
8. a trait that makes it more likely that an individual will survive in a specific environment
9. an organism produced as a result of reproduction
10. a related organism from a previous generation
11. everything (living and nonliving) that surrounds an organism
12. when a huge number of species on Earth die out completely around the same time
15. a group of individuals born and living at about the same time
16. an animal that is hunted or killed by another animal for food
20. a long piece of DNA that contains many genes