A marine scientist is studying the amount of dissolved oxygen in ...

[go.lag]

A marine scientist is studying the amount of dissolved oxygen in a particular area. They are attempting
  to connect the data with the type of organisms found in that area. What kind of marine scientist might
  they be classified as?
  a. Physical oceanographer
  b. Chemical oceanographer
  c. Marine biologist
  d. Marine geologist

Question 2

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

[Tonny]

Answer to Question 1

ANS: B
Chemical oceanographers study dissolved gases and solids in the ocean. They then apply these
measurements to the geology and biology of the ocean as a whole. Information can be found in the
section Marine Scientists Use the Logic of Science to Study the Ocean.

Answer to Question 2

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.