Algumas proteínas funcionam como verdadeiros canais de passagem de substâncias? ( ) Verdadeiro

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How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

Which beat describes the brain stem

What is a difference between systemic and pulmonary circulation? a. systemic circulation carries oxygenated blood to the lungs and pulmonary circulation carries deoxygenated blood to the body. b. systemic circulation carries deoxygenated blood to the lungs and pulmonary circulation carries oxygenated blood to the body. c. systemic circulation carries deoxygenated blood to the body and pulmonary circulation carries oxygenated blood to the lungs. d. systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.