I think is the voice used by authors when seeming to speak for themselves.
Answer:
17: Mitochondria and Chloroplasts
19: The cell membrane is a double-layered sheet called a lipid bilayer. It affects the content of the cell because it controls what goes in and out of the cell.
Answer:
D.more extreme rainfalls
Explanation:
that would be my guess...
hope this helps!!! :)