DK Eyewitness Insects by Laurence Mound pdf free download. An adult insect never grows any larger. It cannot, because it has a hard, external skeleton composed largely of a tough, horny substance called chitin. This “exoskeleton” covers all parts of the body, including the legs, feet, eyes, antennae, and even the internal breathing tubes, or tracheae. Young insects must molt, or shed all these surfaces, several times during their lives in order to grow to adult size. Beneath the old, hard skin, a new, soft skeleton forms. The insect takes in extra air to make itself larger and splits the old skin, which falls off.
DK Eyewitness Insects by Laurence Mound pdf free download
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