Across
2. when selection eliminates the extremes; ___ selection
6. the study of populations
7. a type of density-independent factor
11. number of individuals an area can support; carrying _____
13. a change in DNA
14. rate of growth = birthrate minus ___ rate
15. all the individuals of a species in an area
Down
1. taken every 10 years to determine the U.S. population
3. S-shaped growth curve, ____ model
4. female birds choose mates with the brightest feathers; an example of ____ mating
5. when selection favors an extreme trait, such as longer necks in giraffes; ____ selection
8. a J-shaped growth curve
9. how individuals of a population are arranged in space
10. shows the percentage of a population at each age group; population ___
12. a species that has many young is called an R- _______