O conceito de migração implica: O cruzamento de uma fronteira por período mínimo de 6 meses. Envolve todas as deslocações das populações. Diz respeito apenas a movimentações forçadas. Está relacionado com às deslocações de pessoas por mais de 1 ano.

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion

The answer would be  b. hope this !

Answerencourage alternative timber sources,increase public awareness of the forests,increase research into forestry,involve local communities in forest projectsalso one of the main initiatives of the 1977 act was to introduce a new approach to forest management known as selective management system, this is recognised as one of the most sustainable approaches to tropical forestry management in the world

The answer is a. it makes more sense then the other answers listed there.