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Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.
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● Earthworms do not have specialized respiratory organs like we do.
● They take in oxygen and expel carbon dioxide directly through their skin.
● Oxygen diffuses through the earthworm's body surface and diffuses inward to the network of capillaries lying just under the body surface.
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