How do scientists estimate the atmospheric levels of carbon dioxide that existed on Earth hundreds or thousands of years ago?
A) They deduce it from the carbon dioxide content of fossil fuels.
B) They measure it from bubbles of gas trapped in Antarctic ice.
C) They estimate it from the relative numbers of carbon-based life forms that existed over time.
D) They measure it from erupting volcanoes, bubbling hot springs, and seeping hydrothermal vents.
Correct Answer:
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Q24: What can happen to the carbon dioxide
Q25: Which equation represents photosynthesis?
A) 6CO₂ + 6O₂
Q26: Q27: What is the thick fluid found inside Q28: What process converts carbon dioxide and water Q30: Into what type of energy does the Q31: According to scientists, how do the levels Q32: What is the basis for fossil fuels? Q33: What unconsumed macromolecule from dead organisms eventually Q34: How many membranes surround each chloroplast?
A)
A) 1
B)
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