The gaseous oxygen in the Earth's atmosphere was produced as a by-product of
A) volcanic outgassing.
B) photochemical reactions breaking down ozone (O3 ) to form oxygen (O2 ).
C) photosynthesis.
D) decay of organic matter.
C
You might also like to view...
The reason that precipitation forecasts are the least accurate of all meteorological predictions is
A) moisture cannot be accurately measured. B) moisture is discontinuous. C) because we do not have the capability to accurately track moisture. D) because moisture can indiscriminately change phases.
Which of the following best compares MSW in low-income nations to high-income nations?
A) Low income nations have much more paper in MSW. B) The MSW of high-income nations contains more than 50% organic material. C) The MSW of high-income nations has more paper and less organics than that of low-income nations. D) Proportions of the various categories of MSW are about the same.
Methane(CH4 ) is the second most prevalent anthropogenic greenhouse gas
Indicate whether the statement is true or false
What is the limiting factor that produces specialized adaptations in plants and animals of the desert?
A. light B. moisture C. temperature D. reproductive success E. migration