A tank filled with manure, water and unused crop plant residues but which minimizes oxygen content could be used to
A) produce biogas.
B) produce biogas if the oxygen levels were adjusted to very high concentrations.
C) burn unused parts of crop plants to generate heat for homes.
D) collect and store carbon dioxide in underground wells.
A
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What kind of economy does the U.S. have?
A. high-consumption, high-waste B. low-consumption, low-waste C. high-consumption, zero waste D. no consumption, recycle and reuse
Under which form of economic organization does each sex maintain a respected, productive, coequal role in the kinship group?
A) industrial B) commercial agriculture D) subsistence agriculture
Organisms that lack a rigid internal skeleton for the attachment of muscles but may posses a hard, protective outer covering are ________
a. invertebrates b. vertebrates c. fishes d. plankton
Extratropical cyclones end their lives in a wide variety of unpredictable ways
Indicate whether the statement is true or false