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Spider or insect?:Solution

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Spider only

has eight legs

have glands in the abdomen which produce silk that is then exuded through spinnerets

jointed legs are joined to the cephalothorax

most have eight eyes

young are much like a small adult that moult several times as they grow

do not have antennae

secrete juices that convert prey to a liquid that is sucked, not chewed

have a pair of chelicerae that are used to grasp prey when feeding

body in two parts, cephalothorax and abdomen

breathe through lung-books, tracheae or both

Insect only

body divided into head, abdomen and thorax

head has a single pair of sensory antennae

has one pair of compound eyes and an ocelli for seeing

three pairs of legs are attached to the thorax

may possess wings

breathe through tracheae that open at paired spiracles

all lay eggs and many types undergo a series of developmental changes called metamorphosis

many live in highly structured communities or colonies

Both insect and spider

have an external skeleton and jointed legs

must moult before it can grow

has an open circulatory system i.e no blood vessels carry the blood back to the heart, it just sloshes around the body cavity