Turf and Abiotic Factors:
Spiders are found worldwide, except for in the oceans, and they live in all habitats and at most elevations.
Height and Size:
Spiders range in size from less than 1.0 mm (0.04 in) to more than 10 cm (4 in) in length, with a leg span of up to 20 cm (8 in).
A spider's body is divided into two parts: the front portion, called the prosoma or cephalothorax, and the rear portion, called
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Although all spiders have poison glands that they use for defense and to kill or paralyze prey, only about 30 of the 40,000 spider species produce venom that can cause serious illness in humans. Humans are more likely to be harmed by bee or wasp stings than by the relatively few spider species that can inflict a harmful bite.
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