BIO SCI 94 Lecture Notes - Lecture 13: Deuterostome, Body Plan, Bilateria

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

~the beginning of the animals: a group of multicellular eukaryotes that differ from their protist ancestors in numerous ways. ~photosynthetic eukaryotes then evolved via the endosymbiosis of a photosynthetic protist by a predatory protist. ~next came the evolution of the eukaryotes (nuclear membrane) and at some point in here (~2. Bya) the mitochondria originated through the endosymbiosis of a bacteria by a eukaryotic cell. ~the earth"s atmosphere didn"t contain enough oxygen to support aerobic respiration until the evolution of the cyanobacteria, around 2. 5 bya. ~the first evidence of life on earth has been dated to about 3. 5 bya. ~the first evidence of life on earth has been dated to about 3. 5 bya (there was a typo (mya) on previous versions of this slide). ~the origin of the earth was estimated to have occurred 4. 5 billion years ago. ~all of the animal phyla appeared during the cambrian explosion.