The organisms originally responsible for putting oxygen in Earth's atmosphere lived around:
A) 1) 5 million years ago.
B) 2) 3 billion years ago.
C) 3) 5 million years ago.
D) 3) 5 billion years ago.
E) 6 billion years ago.
Correct Answer:
Verified
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
Q28: The earliest photosynthetic organisms:
A)probably did not produce
Q29: The earliest multicellular animals in the fossil
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
Q34: Multicellularity enables organisms to:
A)be photosynthetic.
B)undergo aerobic respiration.
C)be
Q35: The proposal that certain eukaryotic cell structures
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