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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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lindseyb1220 lindseyb1220
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6 years ago

Why is biosynthesis unlikely to occur today as it did in Earth's youth?
  a. Living organisms have altered oceanic and atmospheric conditions
  b. There is less available oxygen in the atmosphere
  c. Ozone is less protective from the sun's influence
  d. The oceans do not contain enough free iron
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#1
6 years ago

ANS: A
Living organisms have altered the ocean and atmosphere, and those changes are not consistent with
any new origin of life. Plants are now producing oxygen which is then added to the atmosphere.
Oxygen, in the form of Ozone, also blocks the most dangerous wavelengths of light from reaching the
surface of the ocean. Additionally, the many tiny organisms present today would gladly scavenge on
any large organic molecules. Information can be found in the section Life Probably Originated in the
Ocean.
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