With the growth of human population,the number of species has decreased rapidly in America,and some species have even vanished from our planet.
There are several possible reasons for this.Above all,as the human population grows rapidly,a growing number of people came to live where some wild species have been living.Then these species have to move to other places.Some of them probably can not adapt to the new environment and die.
隨著人口的增長(zhǎng)，物種的數(shù)量在美國(guó)迅速減少，一些物種甚至在地球上消失了。
這有幾個(gè)原因。首先，隨著人口迅速增長(zhǎng)，越來(lái)越多的人來(lái)到住在一些野生物種的.生活。那么這些物種遷移到其他地方。他們中的一些人可能不能適應(yīng)新環(huán)境而死亡。
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