What are the five things that the south African government as well as the governments of the world are doing about climate change (10)

genetic variation will increase because of a new habitat and food source.

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.  

for a different answer set the answer would be because the oxygen in the water had depleted (apex)