A black hole has
A. a mass that widely fluctuates.
B. about half the mass of the star from which it formed.
C. about the same mass as the original star from which it formed.
D. infinite mass.
Answer: C
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Was there any time in the last 800,000 years when the concentration of carbon dioxide was higher than it is today?
The question is based on Figure 24-5, showing variations in CO2 and temperature anomalies in Antarctica going back 800,000 years. This temperature record shows the major glacial (cold) and interglacial (warm) periods of the later Pleistocene Epoch (2.58 million to 11,700 years ago). What will be an ideal response?
The 98th meridian marks an important biophysical mark in North America for this biome where increasing aridity produces vegetation of a distinctly different height
A) Midlatitude grassland B) Desert C) Mediterranean shrubland D) Midlatitude broadleaf and mixed forest
the opposite of disruptive selection. Instead of favoring individuals with extreme phenotypes, it favors the intermediate variants.
What will be an ideal response?
Earthquakes result from ________
A) release of gases from the underlying mantle B) energy released from movement at plate boundaries and faults C) separation of layers within sedimentary rock D) global climate change E) surges of magma from the earth's core