<em>it would be b and c</em>
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<em>it's the whole ''ecosystem''</em>
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Answer:
A Calorie is equal to 1000 calories.
A Calorie is equal to a kilocalorie
Explanation:
According to the biological species concept, organisms belong to the same species if they can interbreed to produce viable, fertile offspring. Species are separated from one another by prezygotic and postzygotic barriers, which prevent mating or the production of viable, fertile offspring.