Humans get their energy directly through
photosynthesis.
the sun.
eating food.
all of the above

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.