Amino acids, sugars, proteins, and nucleotides are considered the building blocks of life.
a. true
b. false
ANS: True (In lab experiments that simulated early Earth's atmosphere, these components were formed. The real atmosphere conditions allowed these building blocks to progress into life on Earth. Information can be found in the section Life Probably Originated in the Ocean.)
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Which is an advantage of using hydrogen as an energy source?
A. Hydrogen is locked up in water and organic compounds. B. Hydrogen fuel cells are inexpensive. C. Hydrogen always produces fewer carbon dioxide emissions than coal or natural gas. D. Hydrogen requires no storage systems. E. Hydrogen produces no carbon dioxide emissions if produced with renewables.
This is the least important factor that can influence environmental lapse rate:
A) heating of the lower atmosphere. B) advection of cold and warm air at different levels. C) advection of an air mass with a different environmental lapse rate. D) changes in the amount and type of air-borne pollutants.
What gas comprises the largest portion of Earth's atmosphere?
A) oxygen B) argon C) ozone D) nitrogen E) sulfur
The process by which plants give up moisture to the air is ____
a. evaporation b. transpiration c. evapotranspiration d. precipitation