The first plants probably evolved from

A) plankton
B) algae
C) corals
D) seaweed

B

Physics & Space Science

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At what speed, relative to the frame of the observer making the measurement, is the length of a meter stick 0.60 m?

A) 0.80c B) 0.60c C) 0.50c D) 0.70c E) 0.90c

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An AM station is broadcasting at 980 kHz, while an FM station up the road is assigned 98 MHz. How do their carrier waves compare?

What will be an ideal response?

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Why isn't Earth a perfect sphere?

A. Earth's magnetic field causes the equator to bulge out. B. Rotation causes the equator to bulge out. C. Rotation causes the poles to bulge out. D. Earth is perfectly round.

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Which of the following best describes nuclear forces?

a. They are short ranged. b. They go to zero at r = 0. c. They are long ranged like the Coulomb force. d. They are charge independent.

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Physics & Space Science