Which of these is a hypothesis?
a) salmon are kept in their natural habitat and treated with fungicides whenever infected.
b) the yield of salmon is 2,000 kilograms in the month of april and 1,500 kilograms in the month of october.
c) salmon are more prone to infections during the summer than in other seasons

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

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.