ANSWERS: 5
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No.
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Not at all. It is a MINORITY that are poisonous.
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Not to humans. All have some sort of venom but relatively few are dangerous to humans.
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Technically no spider is poisonous. Poison must be ingestied, or ate, drank. A few spiders are venomous. Venom is injected, Spiders, Wasps, Bees, Snakes all have Venomous varieties.
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No. All spiders use some form of venom (I think), but relatively few have fangs large enough to break human skin. Of those, it is a very small number that have venom powerful enough to kill a full-grown human.
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