The Phanerozoic eon and the Paleozoic era began about ______________ million years ago
Fill in the blank(s) with correct word
545
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Which of the following is true of carbon atoms?
A) They are not crucial to life. B) They can form long, complex, stable chains. C) They have the ability to replicate. D) They link together to form proteins.
Why are supermassive galaxies often found at the cores of rich galaxy clusters?
A) Most of the matter forming the cluster fell into the center to form one large galaxy. B) They are the result of many galactic mergers; one galaxy growing at the expense of others. C) Such a large galaxy attracted smaller galaxies around it to form a cluster. D) Large galaxies, passing a cluster, get captured into the center. E) Many globular clusters swarmed together to form it.
What are the circumstances under which convection can occur in a substance?
A) when the substance is subjected to a strong magnetic field B) when the substance is strongly cooled from underneath C) when dense material is being added to the substance D) when the substance is strongly shaken or disturbed by a strong wind E) when the substance is strongly heated from underneath
If 150 kcal of thermal energy raises the temperature of 2.0 kg of a material by 400 F°, what is the specific heat capacity of the material?
A) 1.35 kcal/kg ? C° B) 0.75 kcal/kg ? C° C) 0.34 kcal/kg ? C° D) 0.19 kcal/kg ? C°