Answer:
The mitochondria, also called the powerhouse of a cell, is present in large numbers in almost every cell in the body.
Explanation:
Answer:
B
Explanation:
because b is the correct answer
Answer:
Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface. Permeable walls - allow gases to pass through. Extensive blood supply - ensuring oxygen rich blood is taken away from the lungs and carbon dioxide rich blood is taken to the lungs.
