Which of the following evolutionary forces can introduce new genetic variation into a population?
natural selection and genetic drift
mutation and gene flow
natural selection and nonrandom mating
mutation and genetic drift

the bedroo..

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

not sure but try c two haploid cells

explanation:

b. read the phase at the intersection of any given temperature and pressure.