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Geology-Sheet-3-Carboniferous-Period
Geology-Sheet-3-Carboniferous-Period

... different during the first part of the Carboniferous period. It was warmer and more humid, and there were no distinct seasons. Average global temperature was 20°C in the early Carboniferous - it is only about 12°C today. Later during the Carboniferous, global temperatures cooled to levels similar to ...
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... 9. A species of rabbit that is found in hot desert environments has longer ears than other rabbits. How are long ears an advantage to desert rabbits? A. Long ears help the rabbit to hear rattlesnakes better. B. Blood flowing in long, thin ears is a cooling mechanism. C. The rabbit uses its long ears ...
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... lifetime, BUT only a limited number of those offspring are able to survive due to environmental limiting factors. – Only the individuals that survive will be able to mate and reproduce, so……”Individuals that have physical or behavioral traits that better suit their environment are more likely to sur ...
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... • Very important organisms on the ancient Earth – Helped to make Earth “habitable” for life to evolve • Marine bacteria are important – Producers, decomposers, food sources, symbionts, pathogens, modifiers of sediments. Bacteria reproduce mainly by asexual reproduction Bacteria have three main shape ...
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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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