Desde o Século XV, a Europa se caracterizou pela forte emigração, povoando inúmeras áreas em todos os continentes. Nos últimos trinta anos, este fluxo se inverteu.
a) Explique as razões desta inversão.
b) Qual o principal mecanismo empregado pelos países europeus para evitar este novo fluxo de migrantes?

Which of the following statements is true? a. there is not enough food produced in the world to feed everyone. b. the biggest cause of hunger and malnutrition is the cost of getting food to people who need it most. c. most countries have enough arable land and resources to feed their own population and export a surplus d. malnourishment is only seen in a few countries with very limited food supplies.

Which characteristics are true of the arabian desert? multiple answers choose all answers that are correct. a. is mostly below sea level b. covers almost the entire arabian peninsula c. contains the largest sand sea in the world d. has very few people living there

Which of the following types of nonrenewable fuel sources requires the storage of radioactive waste? a. coal b. nuclear c. solar d. oil