why do spiders have eight legs? why dont they have 4?

Question

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Answer 1

cuz theyre punx

Answer 2

Because the extra legs give them more traction than four legs would. Also, it enables the spider to use a pair of legs as "spinners" for web making, or as "hands" when it is dealing with a captured bug. The spider is an amazing creature!

Answer 3

Spiders have 8 legs. This sets them apart from insects, which have only 6 legs. The legs are usually long and hairy. The hairs on their legs are used to pick up scents, sounds, vibrations and to detect air currents. Most spiders can move very fast, and some can also jump

Spiders belong to the arthropods, the group of invertebrate animals with jointed legs and an exoskeleton, including spiders and their relatives (scorpions, horshoe crabs, mites), insects, crustaceans (lobsters, prawns, crabs) and centipedes and millipedes.

Spiders similarly are more closely related to other arthropods with a wide range of numbers of legs than to octopi. The presence of 8 legs in both groups is the result of convergent evolution (as is for example, the presence of wings in bats and birds).

Usually the presence of similar structures in unrelated groups of animals shows that there is a strong functional reason for its evolution. In general the possession of 8 legs allows these animals to move with greater facility in directions other than forwards.

Answer 4

Arachnids belong to the arthropod group, which are thought to have evolved from ancient creatures that "crawled" on the oceans floors. They had many legs because this is an ideal solution for moving over sands and rocks underwater. Some of their descendants moved to dry earth and retained their multiple limbs. Eventually they evolved into creatures such as millipedes, centipedes, crustaceans, arachnids and insects.

We, as vertebrates, together with amphibians, reptiles, birds and the rest of mammals, probably evolved from some ancient "crawling" fish. Now fishes do not have many walking appendixes, as a matter of fact most have only 4 lateral fins and a tail fin, these are ideal for high speed swimming. So their earthly descendants adapted these limbs into what we now know as legs to move over ground, and they eventually further evolved two of these limbs into wings and arms.

Answer 5

If they have four legs...they won't be spiders anymore...j/k...they have eight legs..cuz' they make webs and in order to weave a string for the web they need eight legs for more productivity...after making webs the eight legs are used as a defense mechanism...

Answer 6

6 would be the logical number because all insects have that many. If it weren't for the 8 legs, spiders would be classified as insects, no? I think they need an extra back two legs to support their fat abdomen.

Answer 7

I'm thinking it's because they have to BUILD a fancy web that takes hours, then hunt, capture, roll their dinner up into a nice mummy-like meal, then bite their dinner, then proceed to suck the blood out of their dinner, WHILE ALL THIS TIME BALANCING on a web that's about 3/10ths of an inch long. You'd need 8 legs too!

Answer 8

I'd really like to know just what kind of answer would satisfy these people, as the only one without a thumbs down in their answer is "bxenflix".

Answer 9

I agree, eight is too much. Maybe they were initially supposed to be two animals, but there weren't enough heads available, so they merged them.

Answer 10

DARUM.....

Sie können einfach drei Beine verlieren und weiter leben.

Wahrscheinlich waren die fünfbeinigen Spinnen einfach nicht schnell genug. Eigentlich hat jede Spinne acht Beine.

Allerdings kann sie auf der Flucht vor Feinden oder Räubern auch durchaus ein Bein verlieren. Größter Spinnenfeind ist der Vogel, dann kommen Echsen, Kröten und kleine Säuger - den Menschen nicht mitgezählt.

Um sich zu schützen, verstecken sich die Spinnen oder tarnen sich. Dennoch werden sie natürlich oft auch gepackt. Da hilft ihnen die Tatsache, dass sie ihr Bein verlieren können ohne deshalb sterben zu müssen. Wenn Spinnen noch mehrere Häutungen durchmachen, wachsen die Beine wieder nach.

Die Laufbeine sind innen hohl und haben Scharniergelenke. So ähnlich wie bei einer Ritterrüstung. Sie können nur wie unsere Knie in eine Richtung abgewinkelt werden. Damit so ein Bein trotzdem beweglich ist, besteht es aus mehreren Teilen und hat sechs Gelenke.

Es gibt sogar Spinnen, die absichtlich ein Bein verlieren, damit sich ihr Angreifer auf das Bein konzentriert, während die Spinne selbst die Flucht antreten kann.

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Answer 11

why is the sky blue?

why do dogs bark, but cats say meow?

why do we have gravity?

The answer is that is simply the Way Things Are. There is no why. The question is meaningless.