Humans have existed on Earth for about _____

A) 4 million years
B) 5 million years
C) 6 million years
D) 7 million years


A

Physics & Space Science

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The farthest galaxies that astronomers have seen are all elliptical galaxies

a. True b. False Indicate whether the statement is true or false

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The product of a radioactive decay is called the "daughter."

a. True b. False Indicate whether the statement is true or false

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Which produces the narrowest diffraction pattern?

a. white light b. violet light c. yellow light d. red light e. green light

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The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is __________

Fill in the blank(s) with correct word

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