The earliest photosynthetic organisms obtained hydrogen from:
A) water.
B) methane.
C) chlorophyll.
D) hydrogen sulfide.
E) hydrogen bromide.
Correct Answer:
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Q16: The scenario of prebiotic evolution leading to
Q17: The scientists usually given credit for disproving
Q18: Miller and Urey's experiments to simulate prebiotic
Q19: The outer boundaries of laboratory-created vesicles are
Q20: The theory that life began in the
Q22: The first multicellular eukaryotic fossils were:
A)algae.
B)fungi.
C)cyanobacteria.
D)reptiles.
E)amphibians.
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
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