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part of weneger's theory of continental drift was that the original supercontinent broke into two pieces. what were these two land masses called?

laurasia and pangaea

laurasia and gondwanaland

gondwanaland and pangaea

pangaea and eurasia

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.  

i don't understand

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i don't understand your question

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