The U.S. Environmental Protection Agency has listed arsenic, lead, mercury, vinyl chloride, and polychlorinated biphenyls as the _____.
a. top five mutagens
b. most important neurotoxins
c. leading teratogens
d. leading causes of cancer
e. top five toxic substances
Ans: e. top five toxic substances
You might also like to view...
Wangari Maathai's Green Belt Movement in Kenya planted a total of ____________________ trees between 1977 and 2005
Fill in the blanks with correct word
Why isn’t the shift of this 16°C isotherm uniform across all of Eurasia?
Using a straightedge, draw a line across the July temperature map (Map T-28b; shown in color at the back of the Lab Manual) from point “A” to point “B.” This reference line can be thought of as the “hypothetical” position of the 16°C (60°F) isotherm were there no land–water contrasts, ocean currents, and so on. Compare the actual 16°C isotherm, with the line you have just drawn. In places where the actual 16°C isotherm is south of the hypothetical line, temperatures are lower than expected; in places where the actual 16°C isotherm is north of the hypothetical line, temperatures are higher than expected.
Which common feature often contributes to the occurrence of rockslides in sedimentary rocks?
A. Columnar jointing B. Foliation planes C. Bedding D. The stickiness of mud
On this map of the south Atlantic, why is the mid-ocean ridge in the center of the ocean?
A. Seafloor spreading has stopped in this area. B. Seafloor is added to both sides during seafloor spreading. C. Subduction has occurred under one and then another of the adjacent continents. D. Subduction is consuming seafloor beneath both adjacent continents.