which gas is required for Stage 2?
a) nitrogen
b) carbon dioxide
c) oxygen
d) methan
which substances are products of cellular respiration?
a) glucose + oxygen
b) carbon dioxide + water
c) water + glucose
d) oxygen + nitrogen
how are photosynthesis and cellular respiration related?
a) they are the same process
b) they produce the same products
c) they are opposite processes forming a cycle
d) they both use sunlight
which statement best describes the cycling of gases?
a) photosynthesis releases carbon dioxide
b) both processes release carbon dioxide
c) both release oxygen
d) respiration releases CO2; photosynthesis uses it