Active transport. it's the only method of transfer of material that is again concentration gradient
Answer:
The circulatory and respiratory systems work together to pump blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and the bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart and thats how it works.
Explanation:
I think it’s B. I think this cause meiosis is the cell multiplying
The answer is A
RNA is always single strand