Sentence Correction (SC) | Re: The survival of a rare New Zealand species of mistletoe that produces

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