All I know is that spiders have saks or something full of silk, and they let it out and it makes a web.
A web
No. Humans tend to notice the web weavers, especially the orb weavers. But there are loads of other kinds of spiders that hunt their prey in other ways. Wolf spiders use silk only to line burrows and make egg cases.
If by "redback spiders" you mean the kind of widow spiders that grow in Australia, they make the same kind of three-dimensional tangled filament webs that all the member of their Family make. Some other kinds of spiders make orb webs, sheet webs, etc.
A web, dingbat
Spiders spin web all-year round. They are more noticeable outdoors during damp mornings, when the dew sticks to the threads of the web.
Well naturally spiders have an unlimited supply of web. They need a web to catch food, if the web were to get torn and the spider didn't have unlimited web then he'd be out of food and die.
26 spiders
Like other spiders they make a web to catch flying insects.
All spiders are to a degree.
All spiders do not have backbones.
yes