BIOL 121 Lecture Notes - Lecture 23: Asian Black Bear, American Black Bear, Giant Panda
Document Summary
Today"s (cid:271)iologists (cid:271)elie(cid:448)e in the (cid:272)entral propositions of e(cid:448)olution: February 27, 2017: that all li(cid:448)ing things are descended from a common ancestor, that all li(cid:448)ing things (cid:272)an (cid:272)hange and gi(cid:448)e rise to new species. Proailurus e. g. late oligocene early miocene (slightly larger than domestic cat) Strong sharp claws, 4 toes/foot, and well develop canine teeth: ursus. Seen in sk around >70,000 yrs. ago. In eurasia 25 million yrs. ago & nth. Evidence to support the theory of evolution: artificial selection. Selective breeding of animals & plants [by humans] over 100-(cid:1005)(cid:1004)(cid:1004)(cid:1004)"s years. Artificial selection works much faster than natural selection: fossil & fossil record. Fossil record: historical sequence of events. Fossil show multiple of examples of transitional forms: direct evidence for descent w/ modification. Many fossils link early extinct species w/ species living today: e. g. fossil record of whales and their ancestors. Characteristic features of the inner ear (found only in cetaceans: large auditory bulla formed from only the ectotympanic bone.
