What causes the short-term oscillation of CO2?
What will be an ideal response?
CO2 peaks after the northern hemisphere winter, due to low levels of photosynthesis. CO2 is at its lowest after the northern hemisphere summer, due to high levels of photosynthesis.
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Earth’s early atmosphere contained high concentrations of ____
a. oxygen and nitrogen b. carbon dioxide and oxygen c. oxygen and methane d. oxygen and ammonia e. carbon dioxide and nitrogen
Like the typical eastern European city, the skyline of Chisinau, Moldova is dominated by communist era buildings
Indicate whether the statement is true or false
In which of the following do both amino acids have a basic side chain?
A) cysteine and glycine B) cysteine and methionine C) histidine and lysine D) phenylalanine and tryptophan
The atmospheric pressure bands that circle Earth do not change very much with the seasons in the Northern Hemisphere.
Answer the following statement true (T) or false (F)