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compounds such as lipids, carbohydrates, proteins, nucleic acids, vitamins, petrochemicals and some plastics that contain the elements carbon and hydrogen.
thin layer of living tissue between the xylem and the phloem, which is able to divide to make...
a ring of muscle that controls the passage of substances through a tube or body opening.
sharp-edged modified last upper premolar and the first molar in carnivores adapted to shear or...
a large tongue-shaped organ in the mammalian body which secretes hormones and digestive enzymes...
a substance, usually a liquid, in which other substances can dissolve.