BISC 102 Lecture Notes - Lecture 6: Tiktaalik, Elysia Chlorotica, Arthropod
5 Apr 2016
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Animals (not just mammals): multicellular, eukaryotes, and *chemoheterotrophs that ingests and digests food. *it obtains both energy and carbon by eating organic materials a monophyletic group (one ancestral group ) sponges are the most simple living animals. Endosymbiosis: many corals/anemones incorporate living algae in tissues as symbionts lichens also endosymbiotic (fungus & algae) Mollusc elysia chlorotica uses solar energy via chloroplasts taken from algal food source --> chloroplasts derived by free-living ancestors. Timeline of oxygen: biological change slow for rst 3. 5by stromatolites (3. 5bya) banded iron (2. 7 -1. 8 bya) Rst eukaryotes (2. 1 bya) changes more dramatic is last billion years cambrium explosions - sudden/dramatic appearance of diverse and complex marine phylum. Cambrium fauna: marks appearance of most modern animals (phyla) bilateral symmetry diverse animal body parts (many extinct) eyes, gills, carapaces, tentacles, antennae, jointed appendages represented in several key fossil beds (bc - burgess shale/china)
