Which of the following describes the product rule? The probability of two independent events happening is the product of their probabilities. The probability of two mutually exclusive events happening is the product of their probabilities. The probability of two dihybrid events happening is the product of their probabilities. The probability of two dependent events happening is the product of their probabilities.

The probability of two independent events happening is the product of their probabilities.

Explanation:

it's d - life cycles - apex

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.