题目选项分析

The survival of a rare New Zealand species of mistletoe that produces spectacular sprays of scarlet flowers is threatened both because its leaves are extremely tasty to a voracious opossum species and also its flowers are pollinated by two species of birds whose populations are in decline.

The survival of a rare New Zealand species of mistletoe that produces spectacular sprays of scarlet flowers is threatened both because its leaves are extremely tasty to a voracious opossum species and because its flowers are pollinated by two species of birds whose populations are in decline.