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compounds that consist of any combination of elements, but do not usually contain carbon and hydrogen together.
animals with three cellular body wall layers: the ectoderm, mesoderm and endoderm.
a blood vessel that returns oxygenated blood from the lungs to the left atrium of the heart.
the U-shaped part of the nephron tubule situated between the proximal and distal convoluted...
nutrients are obtained by digesting organic compounds that have to be acquired and ingested by...