Which of the following describes the importance of cyanobacteria to early earth atmosphere formation? a.) cyanobacteria released oxygen into the air, creating a protective ozone layer b.) cyanobacteria relased nitrogen into the air, creating a protective ozone layer c.) cyanobacteria absorbed excess oxygen from the air, creating proper amounts of atmospheric oxygen d.) cyanobacteria absorbed excess carbon dioxide from the air, creating a protective ozone layer
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The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?
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Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen
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Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?
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Which of the following describes the importance of cyanobacteria to early earth atmosphere formation...
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