The mass number of an atom is equal to which of the following?
A) the number of protons in the atom
B) the number of neutrons in the atom
C) the total number of protons and neutrons in the atom
D) the total number of protons, neutrons and electrons in the atom
C
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Which of the following processes is exemplified by the green flash?
A. reflection of light by the Earth's atmosphere B. diffraction of light by the Earth's atmosphere C. refraction of light by the Earth's atmosphere D. absorption of light by the Earth's atmosphere
Population growth is determined by ________
A) birth, death, and doubling time B) birth, death, and environmental resistance C) birth, death, immigration and emigration D) birth, death, and total fertility E) birth, death, and emigration
Which of the following represents an addition to soil water?
A) Percolation B) Evaporation C) Transpiration D) Weathering
Animals that have only a single body opening that serves as both mouth and anus include
A) cnidarians only. B) cnidarians and flatworms. C) cnidarians, flatworms, and roundworms. D) cnidarians and sponges.