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What Bugs you
What Bugs you

... If one were to look at the earth they would find that vertebrate animals are a minority while arthropods account for 80% of all animal life on earth. Arthropods have been around for millions of years and some of their ancient characteristics have been carried over into modern arthropods, such as the ...
AQA Level 1/2 Certificate in Biology Specification Specification
AQA Level 1/2 Certificate in Biology Specification Specification

... A scientifically literate person should be equipped to question, and engage in debate on, the evidence used in decision making. The repeatability and reproducibility of evidence refers to how much we trust the data. The validity of evidence depends on these, as well as on whether the research answer ...
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... flanks, and a notochord, a stiff rod of tissue that supports the nerve cord along its back. Paleontologists have long suspected that vertebrate diverged from a lancelet-like relative sometime in the Cambrian period Meanwhile, molecular studies of gene similarities between lancelets and today's verte ...
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STUDY GUIDE - West Ashley High School

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Evolutionary history of life



The evolutionary history of life on Earth traces the processes by which living and fossil organisms have evolved since life appeared on the planet, until the present day. Earth formed about 4.5 Ga (billion years ago) and life appeared on its surface within 1 billion years. The similarities between all present-day organisms indicate the presence of a common ancestor from which all known species have diverged through the process of evolution. More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described.
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