Autotrophs are responsible for _______________ productivity
Fill in the blank(s) with correct word
primary
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Most of the population of sub-Saharan Africa relies on ________ as their main energy source
A) coal B) hydropower C) wood D) dung E) animals
The former Portuguese colony of Macau, reclaimed by China, derives a major percentage of its revenue from what industry?
A) rice exports B) medical supplies C) heavy machinery production D) IT software development E) gambling
This map shows contours of the water table, the location of four factories (labeled A, B, C, and D), and contaminated and uncontaminated wells. Which way will the contamination flow?
A. northwest and southeast, parallel to the contours B. northeast, up the contours C. impossible to tell because the movement of contamination is independent of groundwater D. southwest, down the contours
Which toxic chemical is produced by the burning of wood?
a. Cyanide b. Acetic acid c. Copper chlorate d. Organic peroxide