BIO 311D Chapter Notes - Chapter 25.3, 28.1, 28.4, 28.5: Ediacaran Biota, Cambrian Explosion, Endoplasmic Reticulum
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(cid:1006)5. (cid:1007) key events in life"s history: geologi(cid:272) re(cid:272)ord is a sta(cid:374)dard ti(cid:373)e s(cid:272)ale that di(cid:448)ides earth"s histor(cid:455) i(cid:374)to four eo(cid:374)s . Hadean, archaean, and proterozoic (together about 4 billion years), and the. Phanerozoic eon (half a billion: each era = distinct in earth"s histor(cid:455) They fed on algae: within 10 million years, predators with claws and other features appeared. The colonization of land: larger forms of life; fungi, plants, and animals, venture out of aquatic environment, plants colonized land with fungi, even today, roots and fungi work together. Fungi aid in the absorption of water and minerals from soil: first animals = arthropods (insects and spiders, tetrapod"s (humans) come later. 28. 1 most eukaryotes are single-celled organisms: eukaryotes have a well-developed cytoskeleton. This helps them grow and change shape over time: organisms in most eukaryotic lineages are protists, most protists are unicellular.
