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breaking down of large nutrient molecules using chemical means (e.g. through the action of enzymes) into smaller soluble molecules that can be absorbed by the body.
a species that helps scientists identify the age of sedimentary rocks.
coiled thread-like structures of DNA and histone, which is a protein, in the cell nucleus. They...
a system of support in soft-bodied animals, which relies on pressure of fluids in the body...