What is the reference that astronomers use to denote the luminosity of stars?
A) the luminosity of the Sun
B) the luminosity of the Northern Star
C) the luminosity of Proxima Centauri, our solar system's closest neighbor star
D) the luminosity of the cluster of stars at the center of the Milky Way galaxy
A
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Discuss the development of marine plants to primitive land-based plants to vascular plants to
sphenopsids to gymnosperms. What changes in plant structures were required to make this transition? What will be an ideal response?
Which of the following about temperate deciduous forests is false?
a. Average temperatures change significantly with the seasons. b. They are predominantly a few broadleaf deciduous tree species. c. Areas cleared of trees can return to forest in 100-200 years d. They have nutrient-poor soil. e. Precipitation often spreads relatively evenly throughout the year.
Rebel groups fighting for greater rights and independence from a central government commonly result in
A) a poor standard of living. B) an improved governmental system. C) peace between national groups. D) civil wars.
In which frontal type is there no aggressor air mass?
A) Cold B) Warm C) Stationary D) Occluded E) Low