A genus is
A) a group of species that are closely related to one another
B) a group of species that are particularly intelligent
C) a group of organisms that look similar
D) groups of organisms that are genetically distinct
A
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What causes stars to twinkle?
A) Stars constantly vary in brightness as they expand and contract. B) Interstellar gas along the line of sight to the star absorbs different amounts of radiation. C) The human eye has difficulty seeing faint objects. D) Moving gases in Earth's atmosphere randomly bend light rays from stars.
Which of the following types of galaxies are typically reddest in color?
A) spirals B) ellipticals C) irregulars
Compared to Jupiter, Saturn's atmosphere is:
A) more calm with fewer disturbances or storms. B) more uniform with no significant variation in color in the lower cloud levels. C) more violent with larger storm phenomena easily viewed from Earth. D) much thicker causing the visibility of the lower layers to be reduced. E) more colorful with variations in color easily viewed from Earth.
A capacitor of unknown capacitance C is charged to 100 V and then connected across an initially uncharged 60-mF capacitor. If the final potential difference across the 60-mF capacitor is 40 V, determine C
a. 49 mF b. 32 mF c. 40 mF d. 90 mF e. 16 mF