Oxygen gas produced during photosynthesis orginates as
a) oxygen atoms contained in carbon dioxide are released when the carbon is fixed
b) oxygen atoms are released by the metabolism of carbohydrates
c) a molecule of chlorophyll oxidized by a photon
d) oxygen atoms contained in water molecules
e) a byproduct of nitrogen-fixing bacteria
Ans: d) oxygen atoms contained in water molecules
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A. Arrow A, the tongue extending B. Arrow B, the insect being eaten C. Arrow C, sunlight striking the chameleon D. Arrow D, heat radiating from the chameleon
Tetanus antitoxin can cross the placenta
Indicate whether this statement is TRUE or FALSE.
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on levels of
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