The sentence “The Cretaceous Period ended 66 million years ago” is an example of
a. absolute dating.
b. relative dating.
A
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Scientific hypotheses differ from scientific theories in that they are
a. widely accepted descriptions of what we find happening over and over in nature b. tentative explanations that need further evaluation c. not subject to proper investigation and testing d. arrived at after extensive mathematical modeling e. tentative explanations that need further evaluation and not subject to proper investigation and testing
Compare the CO2 values from 2006 to 2016 in Figure 18.4 with the CO2 values on the Vostok plot in Figure 18.2. Are the values for CO2 levels on the Vostok plot as high as they are now? If so, during which time periods were CO2 levels as high as they are now? If not, what are the highest values for CO2 on the Vostok plot?
What will be an ideal response?
A region with a small amount of arable land and a large number of farmers will have a(n)
A) efficient agricultural practice. B) low physiological density. C) overpopulation. D) high agricultural density. E) low arithmetic density.
Biomes characterize regions with similar types of
A) vegetation and climatic conditions. B) animals and plants. C) soil, water systems, and animals. D) rocks, soil, minerals, and water.