. it is also used widely in construction, for example in window seals and in large constructions such as bridges. another synthetic co-polymer made from butadiene is nbr (nitrile butadiene rubber), the other monomer being propenonitrile (acrylonitrile) . nbr's ability to withstand a range of temperatures...
sea lions have ear flaps called "pinnae", while seals have ear holes. on land, sea lions can walk on all four flippers, seals cannot, they move caterpillar- like....