I believe that it's an exhausted bear. Cellular respiration is the way plants and animals receive energy. If the bear is exhausted, it means it's cellular respiration is lacking.
Answer:
Carbon Dioxide
Explanation:
Snails will produce only carbon dioxide, while the Elodea will produce carbon dioxide and oxygen gas. Snails and Elodea will produce more carbon dioxide, causing the water to turn yellow.
Well it's impossible for different population to have the same name.
So I would say this for the answer.
One population can have the same name.
I would go with B.
Because CO2 is taken through the stomata in the 2nd stage of photosynthesis