Cell transport is useful because it's, essentially, the movement of cells across the blood/veins. Active transport uses energy, while passive transport does not.
D, the black squirrels have survived because black has provided them with an advantage in this environment.
Answer:
The <em>erector</em><em> </em><em>spinae</em><em> </em>is NOT a muscle of respiration
Answer:
The fox is the tertiary consumer.