Here is one answer: our ancestors with different numbers of legs, and the ancestors of spiders, were not alive and breeding. Eight-legged spiders and two-legged people survived and bred. the spider has eight legs because its ancestors had eight legs. Spiders and horseshoe crabs have evolved from the same ancestor! 11th. 2017 г. In the spider class, spiders have eight legs and four pairs of legs on each side of the body. These spiders are small arthropods belonging to the arachnid class. The spider's legs have seven joints (photo: Eky.edu). Humans have only one major joint per limb (knee, elbow, etc.), while spiders have seven joints on each leg. The result of having a multi-joint exoskeleton is that the spider does not have bone support for the flexor and extensor flotillas.
infinitespider.com Изображение: infinitespider.com The spider has eight legs. There were eight legs. Spiders and horseshoe crabs have evolved from the same ancestor! Another answer is: Something like a spider has evolved with so many legs that you can avoid it by pulling one or two legs: Spiders have evolved spare legs. The idea is that it makes sense and there is some evidence to support it
How many legs does a spider have?
Spiders and harvesters can move around with seven legs, but harvesters (or daddy's long legs) decide to use two of their eight legs as "antennas" or antennas. Depends on. The eyesight is not well developed and the spider has some eyes (paired), but the eyesight is not very good.
What are the limbs of the spider's ancestors?
The limbs of some ancestors are now antennae. Some are chelicerae or mandible. Some are walking on foot. Some are "manipulating the legs" (= "arms"). Spiders even have structures that were limbs (to ancient ancestors in the deep fog of time), but now they distribute silk-we call them spinners.
How many legs do spiders and insects have?
All arachnids have 8 legs {spiders, mites, harvesters}, insects have 6 legs (3 pairs). The last word is your clue.
Do spiders have flexors and extensors?
The flexors and extensors give smos movement to the movement of the muscles. Spiders do not have the same movement. The spider's legs have seven joints (photo: Eky.edu). Humans have only one major joint per limb (knee, elbow, etc.), while spiders have seven joints on each leg.
Do spiders always have eight legs?
Yes, all spiders start with 8 legs. However, it is not uncommon to see less than seven spiders. When a spider's paw gets caught, it self-cuts at a specific joint and drops its paw to free it.
Can a spider live without eight legs?
Spiders can live without one, two, or even three legs. It can make their lives more difficult, but they will be okay. If at least one molt remains in the spider's life (molting means molting the exoskeleton because it grows from the exoskeleton and has a new exoskeleton beneath it), re-mote its legs. You can grow.
Can a spider have 10 legs?
The common names given to these spiders may not be reminiscent of horrifying things, but camel spiders are probably the most horrifying spider ever described by researchers. These spiders have 10 legs and have the largest jaws of any spider. They also grow to huge sizes.
Below you will find two helpful answers on a similar topic. 👇
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