Based of cellular biochemistry, how many different domains can life be classified into?
A) 4
B) 3
C) 2
D) 1
B
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Precession of the rotation axis of Earth is caused by
a. the force of gravity from the sun and moon on Earth's equatorial bulge. b. the force of gravity from the sun and Jupiter on the Earth-moon system. c. the magnetic field of Earth. d. the formation and subsequent melting of glaciers during the ice-ages. e. the impact of asteroids.
How many significant figures are there in the number 46.20?
a) 4 b) 3 c) 2 d) 5
The fact that the Earth has moved along its orbit in the time it took to rotate once is the reason for
A) the position of the Celestial Equator. B) precession. C) the difference between solar and sidereal time. D) Earth's 23.5-degree tilt. E) seasons.
For a periodic process, the number of cycles per unit time is called the
A) amplitude. B) wavelength. C) frequency. D) period. E) pulse.