The fact that all cells used in life on Earth are based on the same biochemistry suggests that
A) life originated from a variety of sources
B) life on Earth was created by some omnipotent being
C) all life on Earth shares a common ancestor
D) the biochemistry of life on Earth is universal
C
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The solar nebula theory is NOT able to explain which of the following observed characteristics of the solar system? Another theory would be needed
a. Common direction of rotation of the planets. b. Common direction of revolution of the planets. c. The formation of hydrogen atoms in the solar system from subatomic particles. d. The density of the Jovian planets.
Free Fall: A ball is thrown straight upward from ground level with a speed of 18 m/s. How much time passes before the ball strikes the ground if we disregard air resistance?
A. 3.7 s B. 1.8 s C. 1.1 s D. 0.6 s
Standing waves are created by the interference of
A. two waves that don’t move B. two waves that move in opposite directions but create a pattern that is stationary C. a moving wave and the medium in which it travels D. light and sound waves
When a battery is used to light up a lightbulb,
A) the amount of electrical current flowing into one side of the battery is equal to the amount flowing out of the other side. B) electric charge builds up on the battery terminals but none of it actually flows through the bulb. C) electric charge builds up within the bulb, causing the bulb to light up. D) some of the electrical current produced by the battery is consumed by the bulb, and the rest flows back into the battery. E) all the electrical current produced by the battery is consumed by the bulb.