Answer: the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
Explanation:
Requires energy input from a cell and enables A cell to move a substance against its concentration gradient
One of the RNA molecules formed during the first initial stage of protein synthesis, called transcription, in eukaryotes is mRNA or messenger RNA.
Answer:
<em>A. Natural Selection</em>
Explanation:
