The Gulf of Mexico's dead zone is caused by high levels of ____ in the Mississippi River.
A. coliform bacteria
B. phytoplankton
C. plant nutrients
D. algae
E. cyanobacteria
Answer: C
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A scientist at a canyon notices observes a dike cuts across the sedimentary layers. How did it get there?
A) It was there before the layers; the layers built upon above and beneath it over millions of years. B) There was an earthquake ? a layer of igneous rock was thrust into the sedimentary layers.. C) Magma rose from within the earth and intruded the sedimentary layers. D) A piece of a volcano broke off beneath the earth..
The functional role of a species in its community is its ________
A) habitat B) niche C) selection D) distribution E) place in the food chain
Capillary water is held in the soil against the pull of gravity by surface tension and hydrogen bonding
Indicate whether the statement is true or false
Which carbon is the site of reaction when glucose reacts to form a glucoside?
A) C-1 B) C-2 C) C-5 D) C-6