Research has found that an exposure to ______ has changed the rate of DNA synthesis in cells.

A) temperature
B) radiation
C) stress
D) pollution

DNA Synthesis

The natural or artificial creation of deoxyribonucleic acid molecules, a process crucial for replication and repair in living organisms.

Radiation

Energy that is emitted in the form of waves or particles, used in various fields including medicine and telecommunications.

Temperature

A measure of the internal energy contained in a substance, indicative of its thermal state.