A population is a group of __________.
Fill in the blank(s) with the appropriate word(s).
Answer: individuals of a single species that live and interact in one area
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The United Nations projects that by 2030 the urban population will make up over ________ of the total Earth's population.
A. 20 percent B. 60 percent C. 40 percent D. None of these are correct
Which toxic substance is often used to extract gold and results in harmful environmental effects?
A. acid mine drainage B. carbon dioxide C. sulfur dioxide D. cyanide E. fluoride
In a forest ecosystem, occasional ____________________ fires have a number of ecological benefits
Fill in the blanks with correct word
The collision-coalescence process of precipitation formation is effective when: a. cloud temperatures are above freezing
b. cloud temperatures are below freezing. c. clouds are composed exclusively of ice crystals. d. None of these choices.