(ᵔᴥᵔ) plz me: the meltdown at the nuclear power plant in chernobyl released radioactive particles and energy that can damage cells. this damage to cells can be prevented by all but which of these? a) wood b) lead c) thick concrete d) potassium iodide,

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

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.