Which of these are fundamental physical quantities?
a. space, time, and matter
b. kilograms, seconds, and meters
c. length, time, and mass
d. momentum, energy, and mass
Question 2
What makes stars twinkle?
a. Variations of light output from the distant stars.
b. Reflection by moving water.
c. Being close enough to Earth to appear as tiny discs rather than points of light.
d. The air near the surface of the earth is warmer than the air at the top of the atmosphere.
e. Constant tiny changes in refraction as air molecules move.
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The Pleiades, an open cluster of stars in the constellation of Taurus. These stars share a common mo
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Primates use their space in a variety of ways: home ranges, core areas, and territories.
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