III. Direction: Fill in the blanks to make the sentence correct.

18. Tropical rainforests are so important because they give out _______ which are necessary for animal respiration. It is also the reason why the forests are considered as lungs of the earth.

19. Coral reefs have many importance but most of all they provide _______ animals which makes marine food chains active and continuous. for marine

20. Bad weathers destroy most of the shorelines. In this case, _________ coastlines from erosion by acting as a natural barrier and flood defence. protect​