A certain strain of bacteria used to be susceptible to penicillin. Today, that strain is resistant to penicillin. Which best explains this observation?
A. The bacteria needed to become resistant to survive.
B. The mutation rate in the bacteria population greatly increased.
C. The isolation of the strain caused it to become resistant.
D. A mutation occurred and was passed to future generations.

vodka and hennesy

explanation:

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.  

a. 35°c

b. 25°c

c. 10°c

d. 40°c