Natural selection

6. a way of hiding by looking the same as the background
8. the number of individuals with each trait in a population
9. a group of the same type of organism living in the same area
10. an event or process that leads to a result or change
13. a result or change that happens because of an event or process
14. the process by which the distribution of traits in a population changes over many generations
15. a trait that makes it more likely that an individual will survive in a specific environment
18. a type of molecule that genes and chromosomes are made of
19. a specific characteristic of an individual organism
20. a graph that uses bars to show how characteristics or values are distributed within a group
21. a characteristic that all members of a species have
22. a random change to a gene that sometimes results in a new trait
24. a related organism from a previous generation
25. an organism produced as a result of reproduction

1. when a huge number of species on Earth die out completely around the same time
2. a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group
3. any difference in traits between individual organisms
4. everything (living and nonliving) that surrounds an organism
5. a trait that makes it less likely that an individual will survive in a specific environment
7. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
11. changes in climate over a long period of time that can be caused by natural events or human activities
12. pressure something in the environment that affects an individual’s chances of surviving
16. having died out completely and no longer alive anywhere on Earth
17. a long piece of DNA that contains many genes
23. to receive genes from a parent