Leaves are connected to the stem's vascular system through the
A. petiole
B. leaf veins
C. epidermis
D. blade
Ans: B. leaf veins
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If the United States exports wheat to foreign countries that levy tariffs on wheat imports, the probable result is that the price of wheat will
a. fall in foreign countries. b. rise in the United States. c. rise in foreign countries. d. rise faster in the United States than in foreign countries.
Reef systems
a. are seriously threatened ecosystems. b. are formed from calcium carbonate secreted by coral polyps. c. have symbiotic dinoflagellates in the living coral. d. have shown widespread bleaching; death of corals is being reported worldwide. e. include all of these
Enzymes that cleave DNA at specific sites are called ________.
A. restriction endonucleases B. DNAses C. peptidases D. vectors
The discharge of high levels of microbial nutrients into marine environments has ________.
A. resulted in algal blooms and red tides that have killed marine mammals B. resulted in the production of large hypoxic or anoxic regions C. had negative impacts on shellfish and other bottom-dwelling marine animals D. All of the choices are correct.