Academic friend of mine reckons there's a theory that arachnids disappear from the fossil record at some point and the best theory is that they arrived here in a meteor shower.Sounds ridiculous to me.
2007-10-10 10:33:02 · 6 answers · asked by Bobby H 1 in Science & Mathematics ➔ Zoology
All arachnids (such as spiders and scorpions) share too many nucleobase sequences of their DNA with all other life on Earth to have evolved independently, on some other world.
2007-10-10 11:46:44 · answer #1 · answered by Dendronbat Crocoduck 6 · 0⤊ 0⤋
some exciting spider data! :) A spider is an araneae, an order of arachnid. there are a number of thousand distinctive kinds of spiders. All spiders have 8 legs. maximum spiders have 8 eyes yet some have fewer than 8. they have not got ears, they sense the sound vibrations with tiny hairs on their legs. Their bodies have 2 aspects, the top and the tummy. The abdomen is plump. Spider blood is easy blue. Blood fills up each and every of the empty area interior the spider's physique, it keeps the legs stiff so the spider can stroll. Spiders breathe, too. As spiders strengthen, they molt. meaning they shed their old pores and skin and strengthen a clean one. They molt many cases in the previous they alter into adults. Many spiders stay for below twelve months yet some, like tarantulas can stay lots longer. Spiders are available in distinctive sizes. some are fuzzy and others are comfortable, and that they arrive in many distinctive colorations. Spiders stay in many distinctive kinds of places, water, gardens, properties, and the floor. They stay the place that's warm and the place that's chilly. They stay the place that's moist and the place that's dry. some are poisonous and others at the instant are not. all of them eat bugs and another animals.
2016-10-21 23:10:42 · answer #2 · answered by joleen 4 · 0⤊ 0⤋
It sounds strange to me. If something had arived from a meteor shower it would be bacteria rather than arachnids. Archnids would probably burn up befor even entering the atomosphere. And even if the meteor landed when Earth didnt have an atmosephere, they would die because of the molten rock covering the Earth. There were no other life forms at the time so its almsot impossible for them to survive unless resorting to canabalism and even then their population would be wiped out.
2007-10-10 10:43:14 · answer #3 · answered by damien d 2 · 0⤊ 0⤋
Well, in general spider fossils are relatively rare. They're soft-bodied, they're not abundant in aquatic environments where they can get buried in sediment.
I can promise they didn't leave the planet to take a spin on a meteor and then get dropped back on Earth later. Yep, pretty ridiculous!
2007-10-10 10:48:54 · answer #4 · answered by dunefangirl 2 · 0⤊ 0⤋
From a science fiction story hypothesizing that rats, snakes, and spiders are aliens because so many people have an instant negative reaction to them (I forget who wrote it but it was in the 1940s or 1950s).
2007-10-10 13:20:37 · answer #5 · answered by Howard H 7 · 0⤊ 0⤋
Along with Spiderman. That's silly.
2007-10-10 10:43:12 · answer #6 · answered by musicrow21 3 · 0⤊ 0⤋