Which of the following best describes what is meant by an ecological footprint?
a. It is the average size of the lot on which a family home is built.
b. It is the number of acres necessary to grow enough food to support a family.
c. It is the geographic area in which a person travels during the course of their average daily activities.
d. It is the amount of biologically-productive land and water needed to supply the people in a particular country or area with the resources they need.
e. It is the amount of tillable agricultural land necessary to supply the food requirements of a nation.
D
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Large, stable communities of plants and animals whose boundaries are closely linked to climate and soils are called
A) biozones. B) ecospheres. C) biogeographic realms. D) life zones. E) biomes.
Members of this mineral group all contain the silica tetrahedron: _________. Fill in the blank(s) with the appropriate word(s)
The dwindling supplies of rare metals such as indium, tantalum, and platinum may be extended if we rigorously ________
A) exploit known deposits more efficiently B) reduce demands for social and economic justice C) relax environmental requirements for mining D) increase demand for the products in which they are used E) recycle existing supplies
In your own words, describe the mechanism of natural selection