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  3. Hydrothermal vents along the mid-ocean ridges host ephemeral ecosystems of diverse fauna, including several crustacean spe

Hydrothermal vents along the mid-ocean ridges host ephemeral ecosystems of diverse fauna, including several crustacean spe

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问题             Hydrothermal vents along the mid-ocean ridges host ephemeral ecosystems
      of diverse fauna, including several crustacean species, some of which undergo
      development as larvae up to 1,000 meters above and 100 kilometers away from
Line   the vents. For example, vent crab Bythograea thermydron (at stage of
(5)    larvae) possess image-forming compound eyes with a visual pigment sensitive to
      the blue light of upper oceanic waters. As these larvae metamorphose into
      adulthood and begin to descend to and settle at the vents, they lose their image-
      forming optics and develop high-sensitivity naked-retina eyes. With maturation,
      the spectral absorbance of the visual pigment in these eyes also shifts towards
(10)   longer wavelengths and this progressive visual metamorphosis trades imaging
      for increased sensitivity, and changes spectral sensitivity to the dim, longer
      wavelengths of light existing at the bottom of the ocean. As hydrothermal vents
      produce light, vision may supplement thermal and chemical senses to orient
      post-larval settlement at vent sites.
Which of the following is the most appropriate title for the passage?
选项 A、Adaptive Visual Metamorphosis in Deep-Sea Vent Crabs
B、Aspects of the General Anatomical Development of Deep-Sea Vent Crabs
C、New Research Directions in the Study of Deep-Sea Vent Crabs
D、Common Features of Optics of Lower Depth Oceanic Animals
E、Patterns of Anatomical Transformation in Lower Oceanic Creatures
答案A
解析
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