4.The frogs' natural habitat is becoming more and more developed.

5.Attempts are being made to halt the development of wet marshland.

6.Frogs are important in the ecosystem because they control pests.

7.The platypus frog became extinct by 1991.

8.Frogs usually give birth to their young in an underwater nest.

9.Eight frog species have become extinct so far in Australia.

10.There is convincing evidence that the ozone layer is being depleted.

11.It is a fact that frogs' breeding cycles are upset by worldwide in creases in temperature.

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    Answer Keys1.F 2.F 3.T 4.T 5.NG 6.T 7.T 8.NG 9.F 10.T 11.F