Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks.

A. kinds

B. types

C. families

D. species

A. whose

B. which

C. that

D. who

A. population

B. amount

C. quantity

D. diversity

A. for

B. therefore

C. because

D. so

A. dangerous

B. danger

C. endangered

D. endanger