Chromosomes play a major role in variation because they A. increase rate of reproduction
B. regulate protein production
C. deliver info about the environment
D. reduce the life span
E. changes a protein produced by the organism.
F. release energy

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.

sup bro, im dumb, but this is what i found xd

"the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface"