How is a solid substance affected by adding heat energy to it? a. its mass increases. b. its temperature decreases. c. the motion of its particles increases. d. the motion of its particles decreases.

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.