Answer:
So they can breathe
Explanation:
Without oxygen the fish can't breath, they would then suffocate and die.
Sorry if your asking for a more detailed answer, but I'm not sure what else to say
Answer:
There is sugar on the pig's surface that humans don't have.
Explanation:
"This rapid rejection occurs when human antibodies attach to sugar molecules on the surface of the transplanted pig organ's cells."
Answer:
D
Explanation:
the movement of your digestive system is through muscles within your wall that contract to push food down.
Movement of cell against concentration gradient is called a.osmosis
Answer: Nuetrophils are the most abundant luekocytes (white blood cells).
Explanation: Nuetrophils also known as granulocytes because they have a granule in their cytoplasm, are the most abundant phagocytic white blood cells. They are the first ones to arrive at the site of infection by injury, bacteria or during apoptosis (programmed cell death) in response to chemotaxis and inflammation feedback loops. They bind to bacterial receptors and engulf(digest) them together with any other foreign matter and dead cells.