The photoelectric effect supports the
A. particle nature of light.
B. wave nature of light.
C. both of these for high frequencies.
D. none of the above
Answer: A
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Which term describes species that play crucial roles in helping to keep their ecosystems functioning?
A. cornerstone B. foundational C. keystone D. critical E. primary
The substitution of new materials (plastics, etc.) leads to reduced consumption of the mineral and metal resources.
Answer the following statement true (T) or false (F)
Which of the following determines blood type B in the ABO blood typing system?
A) the presence of only N-acetyl-D-galactosamine antigen B) the presence of only D-galactose antigen C) the presence of both N-acetyl-D-galactosamine and D-galactose antigens D) the absence of both N-acetyl-D-galactosamine and D-galactose antigens
Scientists studying the Florida Everglades have found that between 2003 and 2011, there was a 99 percent decrease in raccoons, a 98 percent drop in opossums, a 94 percent drop in white-tailed deer, an 87 percent decrease in bobcats, and no rabbits or foxes were observed. Which has caused the collapse of mammals in this ecosystem?
A. pythons B. alligators C. hurricanes D. pollution