Which star evolves off the MS first if all formed at once?
A: O-type star
B: 9000K surface temperature star
C: a star twice as massive as the Sun
D: a star with a radius 0.3 times the Sun
E: an M-type star
Answer: A: O-type star
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One reactant of photosynthesis is
a. hydrogen. b. oxygen. c. carbon dioxide. d. methane.
The age of our solar system is approximately
A) 10,000 years. B) 3.8 million years. C) 4.6 million years. D) 4.6 billion years. E) 14 billion years.
Besides Mars, exobiologists find Europa also a good candidate for life
Indicate whether the statement is true or false
Consider the experimental evidence we have discussed in the past few chapters. Classify the following experimental results according to the following scheme: For the quantons in question, the results:
A. Are consistent with a pure wave model. B. Are consistent with a pure particle model. C. Are consistent with either model (the results do not distinguish between models). D. Cannot be explained by either model alone.