17.8: Evolution and Populations- Challenge 1
- Page ID
- 5965
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- 1. ___ are random changes in an organism's genes.
- Mutations
- 2. In Nebraska, natural selection favors deer mice that ___.
- match the color of the soil where they live
- 3. A harmful mutation may become beneficial if ___.
- the environment changes
- 4. Scientists learn about natural selection by looking at older organisms preserved as ___.
- fossils
- 5. Adaptations are ___.
- small genetic changes that build up over time and allow organisms to survive in changing environments
- 6. When glaciers dropped light sand over Nebraska, the deer mouse population became lighter in color on average because ___.
- darker mice couldn't hide from predators as well as light mice, so the environment selected against darker coats
- 7. If a population uses vital resources faster than those resources are being replenished, the population has ___.
- exceeded its carrying capacity
- 8. The formula to calculate the growth rate of a population is ___.
- birth rate - death rate
- 9. ___ is an important abiotic factor affecting population growth.
- Space
- 10. Three characteristics of all life include ___.
- metabolism, being organic, and being capable of replication/reproduction
- 11. To learn about the origin of life, scientists examine ancient microorganisms, study organisms living in extreme environments, and ___.
- perform experiments that recreate the environmental conditions found at that time