It is known as stimulus or the plural form stimuli. It can be external or internal.
The answer is A. Reproductive Disruption
<span> RNA was thought of as little more than a messenger between DNA and proteins, carrying instructions as messenger RNA (mRNA) to build proteins. However, RNA can do far more. It can drive chemical reactions, like proteins, and carries genetic information, like DNA. And because RNA can do both these jobs, most scientists think life as we know it began in an RNA world, without DNA and proteins.</span>
I believe the answer is D) all cells are produced from other cells
