Answer:
Toxins, new habitat, and increased food supply
Explanation:
The next answers are
toxins
predator-prey relationships
competition
new habitat
disasters
Toxins
New habitat
Increased food supply
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The hemoglobin molecule has four binding sites for oxygen molecules: the iron atoms in the four heme groups. Thus, each Hb tetramer can bind four oxygen molecules.
Explanation: your answer is A
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i have niidea sorry