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Hair colour is one of the most obvious characteristics to be used to_______people. 

Species become extinct or endangerment (A) for a number of reasons (B), but the primary cause is the destruction (C) of habitat by human activities(D).

Habitat fragmentation (A) have caused (B) plant and animal species (C) in the remaining islands of habitat to lose contact with (D) others of their own kind.

The organization (35) ____ more than 20 field projects worldwide.

Among other issues, it is also concerned (34) _____ endangered species, pollution, and climate change.

The group says its mission is "to halt and reverse the (33) _____ of our environment".

...voluntary (32) ___ by private individuals and businesses.

It is a charity, with (31) ____ 9% of its funding coming from...