__________ were among the earliest photosynthetic life-forms on Earth.
A) Multicellular plants
B) Lichens
C) Trilobites
D) Cyanobacteria
Correct Answer:
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Q21: _ is the release of volatiles from
Q25: The Earth's modern atmosphere:
A) is composed of
Q26: The highest portion of the atmosphere that
Q27: During photosynthesis:
A) chlorophyll-bearing plants convert oxygen and
Q30: In the _, temperature increases with altitude,
Q31: Atmospheric pressure is measured in _.
A) degrees
Q32: The atmosphere:
A) becomes less dense with increasing
Q33: Which of the following orders of the
Q34: During photosynthesis, plants convert _ and _
Q35: A/an _ is used to measure air
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