Trước đây, tỉ số giới tính của nước ta mất cân đối do nguyên nhân chủ yếu nào?

Do larger countries receive more money in remittances than smaller countries

Compared with the land in the highlands, the lowlands region of england a) rockier and more difficult for farmingb) the center of business and industryc)richer in coal reservesd)covered by more fertile farmland d) covered by more fertile farmland

What are some of the impacts of humans on the earth?