1) Atmospheric Carbon Dioxide.
Trees are an important part to this planet because they take the carbon dioxide out of the air and convert it to oxygen. When deforestation occurs, there are less trees to do this, resulting in more carbon dioxide in the air.
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Cyclic phosphorylation is a kind of phosphorylation in which ATP is formed from an ADP when phosphate group is attached to it during light reaction of photosynthesis.
A. Smallpox could make a good biological weapon because it is an airborne virus.
B. Smallpox can be prevented via vaccination and potentially prevented by HEPA filters.