You are an engineer at a power plant that creates large volumes of hot waste water, which disrupts the ecosystem of the river it drains into. Another part of the plant requires warm oil, and the plant uses large amounts of energy to heat it. Inspired by countercurrent exchange in whales, you save energy and benefit the environment by doing what?
A. Adding a sensor, integrating center and effectors to control temperature in both pipes
B. Running the oil pipes around the waste water pipes, to allow heat transfer from water to oil
C. Running the waste water and oil through a single pipe
D. Running the oil pipes under the river after dumping in the hot waste water
Answer: B
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Mercury Emissions by Continent. By weight, coal does not contain much mercury, but we burn a lot of it. Several industries besides coal-fired power plants contribute substantially to atmospheric mercury pollution. Figure 2.13 shows mercury emissions by industry from different regions of the world in 2006. Which industry tops the list of mercury emitters? Which industry is next on the list?
1.Dental amalgam (cremation); Waste incineration
2.Chlorine production; Cement production
3.Cement production; Metal production
4.Fossil fuel combustion; Gold production
Germ cells are ____
a. found in the zygote b. destined to become gametes c. programmed to become the placenta d. found within the egg prior to fertilization e. larger in size than the original egg
What is the term for a genetic change in a line of descent over time?
a. speciation b. transformation c. reproduction d. evolution e. mutation
Wolves and bears are placed in the same taxonomic order. Therefore, they must also be classified in the same
a) genus b) family c) phylum d) species e) specific epithet