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compounds such as lipids, carbohydrates, proteins, nucleic acids, vitamins, petrochemicals and some plastics that contain the elements carbon and hydrogen.
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
plastids responsible for pigment synthesis and storage. They mainly contain carotenoids, but can...
the fluid that circulates through the lymphatic system. It is similar to blood plasma in...
the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from...
a blood vessel that returns oxygenated blood from the lungs to the left atrium of the heart.