Most of the complex spatial and temporal relationships of periodical cicada broods and species must be less than 10,000 years old, because much of the current range of periodical cicadas in the eastern, Appalachian, and Midwestern U.S. would have been unsuitable for periodical cicadas during and for substantial periods following the Wisconsin ...
Just be sure not to serve her any Jell-O in the near future or your next class speaker may be a representative from PETA. Glue, historically, is indeed made from collagen taken from animal parts, particularly horse hooves and bones. In fact, the word âcollagenâ comes from the Greek kolla, glue.
PVA is part of the vinyl family of plastics, but most things we think of as vinyl, such as vinyl siding and upholstery, LP records, raincoats, etc., are made of polyvinyl chloride, or PVC, the same material used to make white plumbing pipe. Horse. Source(s): http://wiki.answers.com/Q/What_is_glue_m...orsehide glue (what I consider glue to be) is made from cow's hooves, bones, and hides since there aren't enough horses getting rendered anymore, and the hides and hooves provide much the same and are useful other places besides in landfills.