Answer:
An organism that gets its energy by eating plants or animals or An organism that forms the base of the food chain.
Explanation:
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Chromosome are made of DNA.
alleles are the different forms of a gene that can exist.
chromosomes contain genes that control the inheritance of traits.
Object permanence. Meaning they think it is gone for good when it is out of their sight.
2 or 3 because, less food means more fighting to get the remaining