5.Organisms living together in an ecosystem depend upon one another in order to survive. They interact in a number of ways to enable them to acquire food, shelter, protection, support and transportation . Many relationships are symbiotic, i. e. they live together for the benefit of one or both. What do you call a symbiotic relationship A. Mutualism
B. Commensalism
C. Cooperation
D. Parasitism​

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.  

answer/// to address the needs of adults with mental illness and increase their ability to function;