Probability of extinction depends _______ both the population size and fine details of the population demography.
A.from
B.for
C.on
D.in

Many modern medicines are derived _______ plants and animals.
A.on
B.for
C.in
D.from

15,589 species (7,266 animal species and 8,323 plant species) are now considered _______ risk _______ extinction.
A.for / with
B.in / at
C.on / in
D.at / of

Being listed as an endangered species can have negative effect since it could make a species more desirable for collectors and poachers.
A.support
B.awareness
C.impact
D.preservation

A / an _______ species is a population of an organism which is at risk of becoming extinct.
A.endangered
B.dangerous
C.endangerment
D.endanger

A book may be evaluated by a reader or professional writer to create a book ________.
A.reviewer
B.reviewed
C.review
D.reviewing

Boy, stop reading. ________ the book down and go to bed.
A.Put
B.Pick
C.Take
D.Set

Which subject is this book ________?
A.up
B.of
C.on
D.for

We have to apply effective measures to save many plant and animal species _______ extinction.
A.on
B.from
C.in
D.for

Almost half of turtles and tortoises are known to be threatened with ____.
A.extinct
B.extinctive
C.extinction
D.extinctly