with a broom
No they are not
You can find cobwebs in abandoned mine shafts and strongholds.
yes
cob webs and spiders
Either spinnerets or cribellum. Cribellum is less common.
by rapping their young in cob webs
Yes they do get rid of waste products when they are in there webs.
Do you mean "spiders that make cobwebs"? Do you mean "poisonous" (like hemlock tea) or venomous (like cobra venom)? The word "cob" in "cobweb" just meant "spider." So a cobweb is just a spider web. Not all spiders are venomous. No spiders are known to be poisonous. Since black widows make webs, some "cob spiders" are highly venomous.
Simple: A dust web is made of particles of dust and dirt and other things such as leaves, just natural things. A spider web however, is made out of a special kind of silk that most spiders naturally produce and use to create/spin their webs.
It is pretty much the same thing, but free webs are limited in content. They also have ads on their site, in a banner form. Also, it is free, but there is a premium plan that will get rid of the ads.
You Either Ran out of gas, or your igniter has gone bad. if neither of these is the problem clean your burner, it maybe some cob webs got in there and restricting the flow of gas.
At Wal-Mart. They have plenty cheap and kid-friendly decorations. There's fake spiders, fake cob-webs, Winnie-the-Pooh decorations. There is just plenty.