Answer:
Explanation:
C: the Independent Variable would be the weight of the cows
I'm pretty sure it would be the weight of the cows
B) It requires energy
D) It involves the help of carrier proteins.
Cross over? i have no idea lol
Answer:
Oxygen enters the body in the mouth and nose, passes through the larynx and the trachea. The trachea splits into two bronchial tubes, which lead to smaller tubes that lead to 600 million alveoli, which are small sacs surrounded by capillaries. The capillaries take oxygen into the arteries, and the oxygen-rich blood is then pumped into every cell of your body. Once the oxygen has been absorbed, carbon dioxide and water are eliminated through the lungs.
Explanation:
good luck!