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essential vocabulary for biology staar
essential vocabulary for biology staar

... textbook might say Any species from which two or more organisms evolved – it is an ancestor of both species. The places where different populations have lived on earth throughout geologic history – evidence of evolution. Evidence for evolution coming from samples of fossils of various times that sho ...
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Cells - Images

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introduction to animal evolution
introduction to animal evolution

... • Animals 1st appeared in Precambrian in waters, spread to land. • 5 criteria that define animal: • 1Animals multicellular, must get food through ingesting other organisms or organic material. ...
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INTRODUCTION TO ANIMAL EVOLUTION

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Chapter 11 Structure and

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Goal 6: Cell Theory Review Guide

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Precambrian body plans



Until the late 1950’s, the Precambrian era was not believed to have hosted multicellular organisms. However, with radiometric dating techniques, it has been found that fossils initially found in the Ediacara Hills in Southern Australia date back to the late Precambrian era. These fossils are body impressions of organisms shaped like disks, fronds and some with ribbon patterns that were most likely tentacles.These are the earliest multicellular organisms in Earth’s history, despite the fact that unicellularity had been around for a long time before that. The requirements for multicellularity were embedded in the genes of some of these cells, specifically choanoflagellates. These are thought to be the precursors for all multicellular organisms. They are highly related to sponges (Porifera), which are the simplest multicellular organisms.In order to understand the transition to multicellularity during the Precambrian, it is important to look at the requirements for multicellularity—both biological and environmental.
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