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Which do we want high levels of in our blood?

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The world's first truly global economy emerged in the 16th century fueled by trade connecting labor and resources across the Americas, Asia, Africa, and Europe. According to the textbook, which professions benefited the most from the new global economy?

29. What was the impact of the birth control pill on attitudes toward gender and sexuality in the 1960s? a. Widespread access to the pill led to more open discussion of birth control, reproduction, and sexuality in general. b. The availability of the pill played little role in American life because few college women of the period were sexually active. c. The birth control pill drastically increased the number of men who were sexually active. d. The pill resulted in the dramatic decrease of sexually transmitted diseases among both men and women in the 1960s. e. The pill highlighted how the feminist movement was entirely separate from and only came after the so-called sexual revolution.

(Enem/2014) A escolha de uma determinada substância para ser utilizada como combustível passa pela análise da poluição que ela causa ao ambiente e pela quantidade de energia liberada em sua combustão completa. O quadro apresenta a entalpia de combustão de algumas substâncias. As massas molares dos elementos H, C e O são, respectivamente, iguais a 1 g/mol, 12 g/mol e 16 g/mol.Substância Fórmula Entalpia de combustão (KJ/mol)Acetileno C2H2 - 1298Etano C2H6 - 1558Etanol C2H5OH - 1366Hidrogênio H2 - 242Metanol CH3OH - 558Levando-se em conta somente o aspecto energético, a substância mais eficiente para a obtenção de energia, na combustão de 1 kg de combustível, é oa) Etano.b) Etanol.c) Metanol.d) Acetileno.e) Hidrogênio.

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