Answer: I can only help you with one
4. D because you need data fro what ever your doing.
thats as much as i can help vote me the brainleirst
Pulmonary artery carry deoxygenated blood while are there arteries carry oxygenated blood.
pulmonary vein carries oxygenated blood while the other veins carry deoxygenated blood
Answer:
crossing over
Explanation:
Crossing over is where homologs can exchange DNA which leads to genetic variation
Flex to the moon and back
I believe it is the nucleus.
