A makes the most sense, though D could actually be an Ok reason, the other two aren't reasonable, a fire safety action? The door would be better open in a fire emergancy, it makes a quicker escape
Answer:
It depends on what genes has passed down the generations.
Mitochondria are known as the powerhouse of cells because they are responsible for the releasing of energy from food. For example: cellular respiration.
C organs because molecules combine to form cells and organs combine to make organ systems
The answer is D. Digestion.
