Earth's climate ________
A) history is undeterminable because there is no method of studying the climatic history of the planet
B) has been documented to have changed once due to the evolution of green photosynthesizing plants
C) has been stable over the history of the planet
D) will stabilize over the next century, according to the predictions of most scientists
E) is changing as a result of natural and human processes
Answer: E
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Atoms of metallic elements can form ionic bonds, but they are not very good at forming covalent bonds. Why?
A. These atoms are too large to be able to come in close contact with other atoms. B. They are on the wrong side of the periodic table. C. Their valence shells are already filled with electrons. D. They have a great tendency to lose electrons.
A mutation in which one nucleotide is substituted for another is called a
A) nonsense mutation. B) frameshift mutation. C) point mutation. D) none of the above
Which of the following is NOT a nonrenewable resource?
A) oil B) iron ore C) gold D) water
How many times did the supercontinents exist during the past 3 billion years of Earth history?
a. 1~2 times b. 3~4 times c. 5~10 times d. More than 10 times