Study the statement above. nitrogen is not a part of
rogen is not a part of which of these biomolecules?
a. enzyme
b. amino acid
c. nucleic acid
d. carbohydrates

a compound light microscope is used to magnify objects in steps.  

hope it

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.