What evidence exists that suggests modern agriculture is unsustainable?
A) Fresh water is used for irrigating crops.
B) Large amounts of nonrenewable fossil fuels are required.
C) Fertilizers and pesticides are inexpensive and easy to obtain.
D) More food is produced than can be used.
B
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The internal skeleton of echinoderms is made of calcium-stiffened ____ that develop from mesoderm
a. ampullae b. ossicles c. radial canals d. ring canals e. madreporites
DNA was shown to be the transforming substance when only the ________ enzymes could inhibit transformation.
A. DNAase B. RNAase C. lipase D. proteinase
Autism is characterized by ________
A) impaired communication skills B) unusual patterns of behavior C) poor social skills D) all of the above
Which of the following are the three domains proposed in Woese's classification system?
A. Protista, Fungi, and Eukarya B. Monera, Archaea, and Bacteria C. Fungi, Monera, and Archaea D. Archaea, Bacteria and Eukarya