The three grains are rice, wheat, and corn
Rice is the main grain used in places such as Asia ans SEA, corn is mostly used in the Americas, while wheat is mostly found in European countries.
Enzyme functioning is very much depends on it;s structure, and if it denatured due to deviation from normal physical conditions, then it won't function properly. Hence, your sentence is "True"
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C.) Species < Population < Community
Population consists of all similar organisms in a specific area and community is the group of all kind of individual in that specific area
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