Which of the following is not a hypothesis for how life began?
A) Methane and hydrogen sulfide from deep-sea hydrothermal vents and hot springs like those at Yellowstone National Park provided the necessary materials.
B) Methane and ammonia in the early atmosphere combined with the help of lightning or ultraviolet light to produce the first amino acids.
C) Asteroids and comets brought amino acids to Earth.
D) Outgassing and related volcanic materials brought proto amino acids to the surface of the earth.
D
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The Universal Gravitational Constant G
A. produces compatible units on each side of an equation. B. is a relatively small number in the world of physics. C. changes the proportion form of Newton's law to an exact equation. D. all of the above
Why does Earth have water?
a. photosynthesis b. large concentrations of sedimentary rocks c. torrential flooding in Earth’s early history
d. enormous tidal forces in early Earth history e. outgassing and comet impacts
The highest annual values for net radiation (NET R) occur
A) near the equator. B) along the Tropic of Cancer. C) in the midlatitudes. D) north of the equator in the Arabian sea.
What one thing remains relatively constant through the seasons in tropical biomes?
A) moisture B) temperature C) faunal composition D) dry season intensity E) precipitation