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Spiders (order Araneae) are air-breathing arthropods that have eight legs, and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every habitat with the exception of air and sea colonization. As of 2008, approximately 40,000 spider species, and 109 families have been recorded by taxonomists; however, there has been confusion within the scientific community as to how all these families should be classified, as evidenced by the over 20 different classifications that have been proposed since 1900.
Anatomically, spiders differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax and abdomen, and joined by a small, cylindrical pedicel. Unlike insects, spiders do not have antennae. In all except the most primitive group, the Mesothelae, spiders have the most centralized nervous systems of all arthropods, as all their ganglia are fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure.
Their abdomens bear appendages that have been modified into spinnerets that extrude silk from up to six types of silk glands within their abdomen. Spider webs vary widely in size, shape and the amount of sticky thread used. It now appears that the spiral orb web may be one of the earliest forms, and spiders that produce tangled cobwebs are more abundant and diverse than orb-web spiders. Spider-like arachnids with silk-producing spigots appear in the Devonian period about 386 million years ago, but these animals apparently lacked spinnerets. True spiders have been found in Carboniferous rocks from 318 to 299 million years ago, and are very similar to the most primitive surviving order, the Mesothelae. The main groups of modern spiders, Mygalomorphae and Araneomorphae, first appear in the Triassic period, before 200 million years ago.
A vegetarian species was described in 2008, but all other known species are predators, mostly preying on insects and on other spiders, although a few large species also take birds and lizards. Spiders use a wide range of strategies to capture prey: trapping it in sticky webs, lassoing it with sticky bolas, mimicking the prey to avoid detection, or running it down. Most detect prey mainly by sensing vibrations, but the active hunters have acute vision, and hunters of the genus Portia show signs of intelligence in their choice of tactics and ability to develop new ones. Spiders' guts are too narrow to take solids, and they liquidize their food by flooding it with digestive enzymes and grinding it with the bases of their pedipalps, as they do not have true jaws.
Male spiders identify themselves by a variety of complex courtship rituals to avoid being eaten by the females. Males of most species survive a few matings, limited mainly by their short life spans. Females weave silk egg-cases, each of which may contain hundreds of eggs. Females of many species care for their young, for example by carrying them around or by sharing food with them. A minority of species are social, building communal webs that may house anywhere from a few to 50,000 individuals. Social behavior ranges from precarious toleration, as in the aggressive widow spiders, to co-operative hunting and food-sharing. Although most spiders live for at most two years, tarantulas and other mygalomorph spiders can live up to 25 years in captivity.
While the venom of a few species is dangerous to humans, scientists are now researching the use of spider venom in medicine and as non-polluting pesticides. Spider silk provides a combination of lightness, strength and elasticity that is superior to that of synthetic materials, and spider silk genes have been inserted into mammals and plants to see if these can be used as silk factories. As a result of their wide range of behaviors, spiders have become common symbols in art and mythology symbolizing various combinations of patience, cruelty and creative powers.
Anatomically, spiders differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax and abdomen, and joined by a small, cylindrical pedicel. Unlike insects, spiders do not have antennae. In all except the most primitive group, the Mesothelae, spiders have the most centralized nervous systems of all arthropods, as all their ganglia are fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure.
Their abdomens bear appendages that have been modified into spinnerets that extrude silk from up to six types of silk glands within their abdomen. Spider webs vary widely in size, shape and the amount of sticky thread used. It now appears that the spiral orb web may be one of the earliest forms, and spiders that produce tangled cobwebs are more abundant and diverse than orb-web spiders. Spider-like arachnids with silk-producing spigots appear in the Devonian period about 386 million years ago, but these animals apparently lacked spinnerets. True spiders have been found in Carboniferous rocks from 318 to 299 million years ago, and are very similar to the most primitive surviving order, the Mesothelae. The main groups of modern spiders, Mygalomorphae and Araneomorphae, first appear in the Triassic period, before 200 million years ago.
A vegetarian species was described in 2008, but all other known species are predators, mostly preying on insects and on other spiders, although a few large species also take birds and lizards. Spiders use a wide range of strategies to capture prey: trapping it in sticky webs, lassoing it with sticky bolas, mimicking the prey to avoid detection, or running it down. Most detect prey mainly by sensing vibrations, but the active hunters have acute vision, and hunters of the genus Portia show signs of intelligence in their choice of tactics and ability to develop new ones. Spiders' guts are too narrow to take solids, and they liquidize their food by flooding it with digestive enzymes and grinding it with the bases of their pedipalps, as they do not have true jaws.
Male spiders identify themselves by a variety of complex courtship rituals to avoid being eaten by the females. Males of most species survive a few matings, limited mainly by their short life spans. Females weave silk egg-cases, each of which may contain hundreds of eggs. Females of many species care for their young, for example by carrying them around or by sharing food with them. A minority of species are social, building communal webs that may house anywhere from a few to 50,000 individuals. Social behavior ranges from precarious toleration, as in the aggressive widow spiders, to co-operative hunting and food-sharing. Although most spiders live for at most two years, tarantulas and other mygalomorph spiders can live up to 25 years in captivity.
While the venom of a few species is dangerous to humans, scientists are now researching the use of spider venom in medicine and as non-polluting pesticides. Spider silk provides a combination of lightness, strength and elasticity that is superior to that of synthetic materials, and spider silk genes have been inserted into mammals and plants to see if these can be used as silk factories. As a result of their wide range of behaviors, spiders have become common symbols in art and mythology symbolizing various combinations of patience, cruelty and creative powers.
four lokos are blackouts in a can and the end of my morals. (fb page)
I like the watermelon and lemonade flavor. Joose doesn't stand close, not even with their recent 12% flavors. People say hipsters try to be cool by drinking this shit but I just like the idea of getting fucked up for less than $3.
I like the watermelon and lemonade flavor. Joose doesn't stand close, not even with their recent 12% flavors. People say hipsters try to be cool by drinking this shit but I just like the idea of getting fucked up for less than $3.
Do you cromagnons know how hward it was for me to sign into this site? I kept on clicking the Facebook link. Embarrassing! Demoralizing! But I still persisted. I've been coming here since PAC IS ALIVE theories were, well, alive. Since hitemup wasn't a cheap portal to bullshit. Since some dude named Jon was the head mothafucka in charge. Since Eminem hadn't inflicted his Pac worship upon the fanbase. Since loving MATW and 7DT didn't jump the chark. Staring at the World thru My Rearwie si still one of my top 10 of all time jams. GO AHEAD BABY SCREAM TO GOD, HE CANT HEAR YOU. sabbath could onlt dream of coming close to that shit. in 2010 rap music is fucking weak--i can't imagine krit pulling the shit that some of these biters would and do so casually. kdi cudi? are you fucking serious? CMON DAWG. no. this can't be life. this can't be hte future. it shouldn't be. some fuckboy in skinny jeans with a good memory and a decent disposition--no, that's not the hiphop i came up with and identified with and came to love. hiphop to me is ugly. it makes you dance and feel bad about it. i tmakes your igrlfriend feel like a whore in good ways and bad.
i live in philadelphia now. i've been here for a few weeks. it's ramadan so i've been restricted. no food or drink during daytime. no sex at all period. you know what that does to a motherfucker? it makes you get to know people. people don't liek beanie sigel or freeway or young chris. they epsically don't like young chris. they loved beanie back in the day and philly freezer too. for the hits .that' sit.
i don't want to know people.
people are fucking stupid. people don't get hiphop anymore. they don't get what it was. what it shoudl be. what tt is --- yeah they get that. sorry to say but wiz khalifa and rihanna pretty much have the entire s[ectrum of the genre between themn. sometimes i feel like i'm the only dipshit in the world hwo feesl who felt goosebumps the first time they heard As Small As a Giant.
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i live in philadelphia now. i've been here for a few weeks. it's ramadan so i've been restricted. no food or drink during daytime. no sex at all period. you know what that does to a motherfucker? it makes you get to know people. people don't liek beanie sigel or freeway or young chris. they epsically don't like young chris. they loved beanie back in the day and philly freezer too. for the hits .that' sit.
i don't want to know people.
people are fucking stupid. people don't get hiphop anymore. they don't get what it was. what it shoudl be. what tt is --- yeah they get that. sorry to say but wiz khalifa and rihanna pretty much have the entire s[ectrum of the genre between themn. sometimes i feel like i'm the only dipshit in the world hwo feesl who felt goosebumps the first time they heard As Small As a Giant.
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How vast is the universe? We're talking about everything that existed isnce the bIg Bang. We've found evidence of life on the moon, the mars. How arrogant woul d it be to assume we're alone at this current moment in time? idk about greys, about indepdence day fucking aliens, about aliens fucking aliens, pradotrs and all that shit. if we've found other life on this unvierse, i tmight be incomprehensible. it mihght be fucking carbon-eating monsters who want us to conitnue in our ways. idk. i've not been educated in recognizing hte alien species when they walk among us. why does alienness have to be remotely relatable to us? if hte aliens are here, hen they AREHERE. in shapes we cant imagine besides biblical/quranic/etcetcwhatwhathoodiehoobitchboywhat form. dont question it.
i know hte angles. i know her gsquared spot. i know your mother. i love her. she made you. you are an asset to this world of ours. and she is too because she made you. and il ove her for it. and before you think i'm sappy, tha tmeans i repeatedly plow her every now and again. i'm not the only one. but i am the one. i am the one.
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