They evolved during the Cretaceous period . Butterflies and moths are important pollinators of these plants. An army is a group of caterpillars. Arthropods are a group of animals with exoskeletons made of chitin, segmented bodies and jointed limbs. Insects, arachnids, trilobites, crustaceans, and others are arthropods.
Autotrophs are the base of the food chain .
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