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Oklahoma School Testing Program
Oklahoma School Testing Program

... than the previous two levels. The cognitive demands of a Level 3 are complex and abstract. The complexity does not result only from the fact that there could be multiple answers, a possibility for both Levels 1 and 2, but because the multi-step task requires more demanding reasoning. In most instanc ...
Common Misconceptions/Alternative conceptions in Primary Science
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... Misconception: The second bulb is less bright than the first bulb in a series circuit because electric current has been ‘used up’ by the first bulb in the circuit. Fact: Both bulbs are equally bright if they are identical. The current flowing through both bulbs is the same in a series circuit and de ...
Common Misconceptions Adaptation: Misconception: Individuals
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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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