In the accompanying hydrograph for a major river, a flood was caused by a single episode of heavy rainfall 50 kilometers upstream. When did the rain most likely occur?
A) At time A
B) At time B
C) At time C
D) At time D
A) At time A
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Which of the following statements best describes insect species as a group?
a. They have backbones. b. About two million species have been identified by scientists. c. They are resistant to extinction. d. They have skin or integument similar to mammals. e. They do not spread human diseases.
Each year, at least 250,000 children under 6 years of age go blind from a lack of ____.
A. iron B. calcium C. vitamin A D. vitamin B E. vitamin C
____ is the tool to finding solutions for environmental problems
a. Education b. Research c. Commissions and policies d. Time
Because the amount of solar radiation received by the Earth is constant, factors such as greenhouse gas concentrations, atmospheric particulate concentrations, and oceanic circulation must be the principal driving factors of climate change
Indicate whether the statement is true or false