The oxygen cycle is extremely complicated and is summarized only briefly here. Oxygen occurs in many chemical forms and is released into the atmosphere in a variety of ways. Most of the oxygen in the atmosphere is molecular oxygen produced when plants decompose water molecules in photosynthesis. Some atmospheric oxygen is bound up in water molecules that came from evaporation or plant transpiration, and some is bound up in the carbon dioxide released during animal respiration. Much of this carbon dioxide and water is eventually recycled through the biosphere via photosynthesis.
The purpose of the paragraph is
a. to inform the reader of the complexity of the oxygen cycle.
b. to describe how photosynthesis takes place.
c. to compare the chemical forms in which oxygen occurs.
The tone of the paragraph is
a. judgmental. b. informative. c. analytical.
Question 2
Your purpose for reading, the difficulty of the material, and your reading ability should determine how fast you read.
Indicate whether the statement is true or false
The sexual cycle of flowering plants involves alternation of sporophyte and gametophyte generations.
Reactions of the Krebs cycle.
The oxygen sensor provides a quick response at the stoichiometric air–fuel ratio of 14.7:1.
Adding propane to the air inlet of an engine operating in closed loop with a working oxygen sensor ...
When the engine is cold and before the oxygen sensor is hot enough to achieve closed-loop, the ...
Life cycle of a fern