Answer the following question given this paragraph: Microevolution occurs in a population when its allele frequencies change over time. There are four major forces of evolution that cause allele frequencies to change: mutation, gene flow, genetic drift, and natural selection. Q: Microevolution occurs in a population when what frequencies change over time? A:

OPTIONS:
- eukaryote
- molecule
- antenna
- allele

Answer: allele

Answer the following question given this paragraph: Other dry climates get a little more precipitation. They are called steppes . These regions have short grasses and low bushes (see Figure below ). Steppes occur at higher latitudes than deserts. They are dry because they are in continental interiors or rain shadows. Q: What is the term for dry climate regions at higher altitudes that have short grasses and low bushes? A:

OPTIONS:
- deserts
- fringes
- prairie
- steppes

Answer: steppes

Answer the following question given this paragraph: Prevailing winds are the result of atmospheric circulation cells. They influence the climate of a region. Q: What do prevailing winds influence? A:

OPTIONS:
- weather
- temperature
- barometric pressure
- climate

Answer: climate

Answer the following question given this paragraph: Figure 18.19 The shape of the male reproductive organ varies among male damselfly species, and is only compatible with the female of that species. Reproductive organ incompatibility keeps the species reproductively isolated. Q: What keeps various species from mating and reproducing outside their own species? A:

OPTIONS:
- digestive system incompatibility
- brain organ incompatibility
- cancer organ incompatibility
- reproductive organ incompatibility

Answer:
reproductive organ incompatibility