Answer: a.
Explanation: because i got it right on a test i had
D.
They break down dead organisms.
Answer:
For example, plasma membrane proteins carry out functions as diverse as ferrying nutrients across the plasma membrane, receiving chemical signals from outside the cell, translating chemical signals into intracellular action, and sometimes anchoring the cell in a particular location (Figure 4).
Explanation:
(B) All cars traveled at different speeds. Sorry if im wrong