The earliest photosynthetic organisms:
A) probably did not produce oxygen.
B) probably used water as a source of hydrogen.
C) probably used hydrogen sulfide as a source of hydrogen.
D) date back to the time when life first emerged on Earth.
E) possessed chloroplasts.
Correct Answer:
Verified
Q23: The earliest fossil organisms resemble modern:
A)protists.
B)green algae.
C)eukaryotes.
D)prokaryotes.
E)protocells.
Q24: Modern invertebrates first appear in the fossil
Q25: To be classified as a eukaryote, an
Q26: If the early Earth's atmosphere contained little
Q27: Probably the greatest advantage for the original
Q29: The earliest multicellular animals in the fossil
Q30: The organisms originally responsible for putting oxygen
Q31: One advantage that enabled the seed plants
Q32: The first multicellular terrestrial organisms were:
A)plants.
B)insects.
C)fungi.
D)amphibians.
E)reptiles.
Q33: About 530 million years ago, what adaptation
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