Which statement best describes a cell? A. A compartment that contains DNA and regulates when genes are turned on and off.
B. The smallest structural and functional unit of an organism that can be said to be alive.
C. A sac-like membrane that stores water.
D. A small compartment that includes a cytoplasm, a nucleus, and a cell membrane.

gag reflex, poor dentition, gum retraction

have a good day

i think its both a and b

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.  

the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).