What is the study of life as revealed by fossils?
A)genetics
B)paleontology
C)classification
D)history
E)geology
B
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The darkest zone of the sea is the
a. euphotic zone b. abyssal zone c. bathyal zone d. coastal zone e. benthic zone
The loss of two protons and two neutrons from the nucleus is:
a. alpha decay. b. beta decay. c. electron decay. d. electron capture. e. half-life decay
We have not yet established the impact of solar variability on the Earth's climate system because:
A) satellites have not yet been around long enough to provide a data set of adequate length. B) most scientists now agree that solar output is constant and does not vary. C) it is not a legitimate enough theory to gain much attention from the scientific community. D) we have no way of measuring solar variability directly.
Which term describes the process that occurs as Arctic sea ice melts, exposing the ocean to absorb more radiation, warm, and further melt the ice?
A. equilibrium B. positive feedback C. inputs D. negative feedback E. outputs