Over-exploitation for food, pets, and medicine, pollution, and disease are recognized _______ a serious threat _______ extinction.
A.as / of
B.over / with
C.upon / at
D.to / for

Clearing forests for timber has resulted _______ the loss of biodiversity.
A.in
B.with
C.at
D.for

Life on Earth is disappearing fast and will continue to do so unless urgent action is taken.
A.polluting
B.damaging
C.destroying
D.vanishing

The Bali Tiger was declared extinct in 1937 due to hunting and habitat loss.
A.diversity
B.natural environment
C.reserve
D.generation

World Wide Fund for Nature was formed to do the mission of the preservation of biological diversity, sustainable use of natural resources, and the reduction of pollution and wasteful consumption.
A.extinction
B.development
C.contamination
D.energy

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