Answer:
cardiovascular and respiratory systems
Explanation:
the cardiovascular system includes your heart and blood vessels, which function to remove deoxygenated blood from and return oxygenated blood throughout your body
I really think that its the second one; Nihilist
three domains , archae- 1st appeared, prokaria- not closed by nucleus and eukaria closed by nucleus
A vaccine uses a live pathogen that is too weak to make you sick. Once it enters your body you defeat it easily. Now that yur body is familiar with it your body can fight off the disease in the future.