One theory for the origin of life suggests that life formed spontaneously from increasingly complex chemical reactions on the Earth. This is referred to as
A) intelligent design
B) naturism
C) panspermia
D) chemical evolution
D
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A photoheterotroph gets its energy from
A) chemical reactions and its carbon from other organisms B) the Sun and its carbon from other organisms C) the Sun and its carbon from its environment D) chemical reactions and its carbon from its environment
When dark matter is added, what happens to the speeds of the inner and outer stars?
A.) All the speeds increased the same. B.) The stars near the center slowed down, but the outer ones were accelerated. C.) All the stars sped up, but the outer ones gained the most speed. D.) All were slowed down by the tidal drag of the dark matter. E.) There was no change.
As a stream flows downslope, if stream discharge doubles and the cross-sectional area of the channel also doubles, what happens to the average stream speed?
A) Average stream speed stays the same. B) Average stream speed decreases. C) Average stream speed increases. D) Not enough information is given.
If a helium-filled balloon is released on Earth, it rises. How would a helium-filled balloon move if it were released a few feet above the surface of the moon?
A) It would remain suspended at the point of release. B) It would rise. C) It would fall, but much more slowly than a rock dropped on the moon. D) It would turn into a giant pumpkin. E) It would fall at the same rate a rock falls when dropped on the moon.