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Question
The immune system has specialized cells and tissues that protect the body against disease and harmful substances by forming ____________________, which are specialized proteins that render invading agents harmless.
Answer
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Related questions
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In the United States, almost two-thirds of all liquid hazardous wastes are ____.
a. recycled into useful materials
b. bioremediated
c. injected into deep disposal wells
d. incinerated
e. stored in guarded facilities
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What process involves the use of plants to remove contaminants from polluted soil and water?
a. phytoremediation
b. plasma gasification
c. bioremediation
d. incineration
e. composting
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What is a disadvantage of cap-and-trade policies?
a. There is no clear legal limit on emissions.
b. There are no rewards to cut emissions.
c. There is no record of success.
d. The expense to consumers is very high.
e. The revenues are not predictable.
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Explain why infants and children are more susceptible to the effects of toxic substances than adults.
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Discuss the specific hazards we face from infectious diseases and exposure from chemicals and make a general statement about how we can reduce these major risks.
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What purpose does the accompanying graph serve in our challenge of evaluating hazardous chemicals?
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In the accompanying figure, how many more women between 20 and 24 years of age would survive if AIDS were eradicated?
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Examples of chemicals that can be ____________________ include DDT, PCBs, and methylmercury.
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It is estimated that approximately one of every 12 women of childbearing age in the United States has enough ____________________ in her blood to harm a developing fetus.
Q:
What is an advantage of geothermal power?
a. The cost is relatively low at most sites.
b. There are a great variety of suitable sites.
c. There is a medium net energy yield and high efficiency at accessible sites.
d. There is zero noise and no greenhouse gas emissions.
e. There are government subsidies and tax incentives that make the systems relatively cheap.
Q:
The worlds second fastest-growing source of electricity after solar cells has been ____.
a. nuclear power
b. cogeneration power
c. coal power
d. wind power
e. hydropower
Q:
What can we do when constructing new buildings to cut heating costs by up to 20%?
a. The building can be oriented to face the sun.
b. Passive solar heating systems can be installed.
c. Active soar heating systems can be installed.
d. Superinsulation can be added to the walls and ceilings.
e. Living or green roof tops can be added.
Q:
Mining has polluted mountain streams in about 40% of the western U.S. watersheds and accounts for 50% of all the countrys emissions of toxic chemicals.
a. True
b. False
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Nonrenewable mineral resources renew over millions to billions of years.
a. True
b. False
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It is well-documented that while some synthetic pesticides have caused great harm to living creatures, others have saved lives. Give a brief account of one that has, ironically, saved human lives: DDT.
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The speciesarea relationship suggests that if 90% of a coral reef is lost, then ____.
a. 90% of the species utilizing the reef will go extinct
b. 100% of the species will go extinct
c. 50% of the species will go extinct
d. speciation of invasive animals will increase
e. the habitat will forever become fragmented
Q:
Extinction recoveries can ____.
a. never happen
b. take several million years
c. happen over a few hundred years
d. be detrimental to existing species
e. only happen in the absence human activity
Q:
If a carbon atom combines with oxygen atoms to form CO2, this would be described as ____.a. a physical changeb. a chemical changec. both a physical and chemical changed. first a physical change, but then it becomes a chemical changee. neither a physical change or a chemical change, but a scientific change
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The law of conservation of matter states that whenever matter undergoes a physical or chemical change, ____.a. atoms can be createdb. atoms can be destroyedc. atoms cannot be created or destroyedd. atoms can be destroyed if we compost theme. atoms can be created by reactions between organic compounds
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____ are the fundamental structural and functional units of life.a. Ionsb. Atomsc. Compoundsd. Moleculese. Cells
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All organic compounds are characterized by the presence of ____.a. carbonb. hydrogenc. oxygend. nitrogene. phosphorus
Q:
An acidic solution would have ____. a. more hydroxide ions than hydrogen ions and a pH greater than 7 b. more hydrogen ions than hydroxide ions and a pH greater than 7 c. more hydroxide ions than hydrogen ions and a pH less than 7 d. more hydroxide ions than hydrogen ions and a pH of 7 e. more hydrogen ions than hydroxide ions and a pH less than 7
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Zoos and aquariums can be used to protect wild species and serve as gene banks.
a. True
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Please list at least two methods of limiting the harmful impact of invasive species as described in your text.
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Birds are excellent ____________________ species because they respond to habitat and climate changes very quickly relative to other kinds of plants and animals.
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Large terrestrial regions characterized by a particular type of climate and a certain combination of dominant plant life are called ____.
a. biozones
b. communities
c. populations
d. biomes
e. niches
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There are ____ separate belts (Hadley cells) in which warm air rises and cools, then falls and heats up again in great rolling patterns.
a. two
b. four
c. six
d. eight
e. ten
Q:
Human population growth since 1960 has been evenly distributed around the world.
a. True
b. False
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Specialized traits or behaviors that allow a reduction of interspecific competition through species specialization in resource use, allow for _________________________.
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The interaction between a lion and a hyena fighting over a dead zebra on the African Savannah is best described as ____________________.