What do these underwater worlds look like? More
( 35 )than a dozen of these warm-water oases have been
discovered in the Pacific so far, and the specific life
forms that arise in them vary according to whichever
species of larva first colonize the site. But the
inhabitants of these deep-sea communities can include
( 40 )clams, mussels, crabs, and octopods. The environment
often produces sights that are spectacular to behold—
clams measuring some 20 centimeters can cover the
ocean floor. One oasis, ironically known as the Garden
of Eden, is populated by huge tube worms that lack
( 45 )mouths and digestive tracts and obtain their energy
instead from bacteria living in their tissues.
33. Which of the following best tells what the passage is about?(A) the origin of life on earth
(B) the importance of photosynthesis for animal life
(C) the spectacular sights of deep sea exploration
(D) the evolution of chemosynthetic ecosystems
(E) the ecology of the eastern Pacific Ocean34. This passage suggests that most life is ultimately dependent on what?(F) deep-sea hot springs
(G) the world’s oceans
(H) bacterial microorganisms
(J) light from the sun
(K) chemosynthesis35. Why is the ecosystem described in this passage called “unique” (line 16)?(A) It has no need for an environmental source of energy.
(B) It thrives in the absence of sunlight.
(C) It exists in airless, waterless surroundings.
(D) It is infested by dangerous octopods.
(E) It is the only ecosystem found in deep ocean water.