How does rna polymerase know where to start transcribing a gene into mrna?

How are rocks that cooled within magma chambers found on earth’s surface today? they are pushed up by magma under earth’s surface. they are revealed by erosion of earth’s surface over time. they are pushed to earth’s surface because of their larger size. they are revealed at earth’s surface due to their low density.

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

The negative impacts of nonnative species generally outweigh the positive impacts