BIOL 1F90 Lecture Notes - Lecture 3: Burgess Shale, Symmetry In Biology, Cambrian Explosion

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*increase in size, increase surface are, invagination of cell membrane. *pinching off of cell membrane invaginations to form nuclear membrane and form endoplasmic reticulum. *first prototype of eukaryotic cell with nuclear membrane and endoplasmic reticulum. *other prokaryotes were also forming at this time- protobacteria, aerobic. Volvocine green algae display variations in the degree of multicellularity. Multicellular animals emerged toward the end of the eon. Proliferation of multicelullar eukaryotic life extensive during phanerozoic eon (543 million years ago today) Warm and wet with no ice at poles. Cambrian explosion - abrupt increase in diversity of animal species. All existing major types of marine invertebrates plus many that no longer exist. Although new species have arisen since, no major reorganizations of body plans. World"s most significant discovery, mainly because of their great age (~505 million years ago) Allowed soft bodies to be fossilized as well.

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