These grassland soils are some of Earth's most significant agricultural soils
A) Aridisols B) Gelisols C) Inceptisols D) Mollisols
D
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What is the major source of chlorofluorocarbons implicated in the thinning ozone layer?
a) Chemical chloroforms used in preservation b) The burning of high sulfur coal c) Refrigerants and aerosol can propellants d) Fluoride treatment in municipal water systems
Bioprospectors are ____.
A. miners that cause the extinction of plants and animals B. people who search for plants and animals that scientists can use to make medicinal drugs C. plants that contain phytochemicals D. conservation biologists that promote ecotourism E. people who decide which species should be protected
Polyploidy is an evolutionary mechanism that may result in
A. the baldness trait becoming dominant in men. B. a surge in birthrates in mammals. C. new plant species. D. death if recessive.
Water most commonly percolates from ____
a. the zone of saturation to the zone of aeration b. the zone of saturation to the zone of porosity c. the zone of aeration to the intermediate zone d. an aquifer to an aquiclude