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Question
On the accompanying graph, explain what the designation LD50 means.
Answer
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Related questions
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Zoos and aquariums can be used to protect wild species and serve as gene banks.
a. True
b. False
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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.
Q:
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
Q:
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 ____________________.
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A common tick is an example of a(n) ____________________.
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MatchingMatch the items listed below with the appropriate choice.a. interspecific competitionb. predationc. parasitismd. mutualisme. commensalismf. mimicryClownfish live amongst the stinging tentacles of sea anemone. They keep the sea anemone tentacles clean by eating the debris, and they gain protection from other animals by living in the tentacles.
Q:
MatchingMatch the items listed below with the appropriate choice.a. interspecific competitionb. predationc. parasitismd. mutualisme. commensalismf. mimicryYour housecat kills the mice in your yard and around your house.
Q:
Genes mutate, individuals are selected, and populations evolve.
a. True
b. False
Q:
The ____ was deliberately designed to measure outputs, without taking into account their beneficial or harmful environmental impacts.
a. free market
b. market pricing structure
c. gross domestic product
d. genuine progress indicator
e. government subsidy system
Q:
The economically and politically powerful interests that receive perverse subsidies spend a lot of time and money on ____, thus shifting to non-perverse subsidies would be difficult.
a. lobbying
b. lawyers
c. bribes
d. policies
e. politicians
Q:
In a market-based economic system, economic decisions about prices are controlled by ____.
a. supply and demand
b. the government
c. past customs and experience
d. the banks
e. full-cost pricing
Q:
Less than 10% of the U.S. public considers the environment to be one of the nations most pressing problems.
a. True
b. False
Q:
Ecological economists consider natural capital to be important but not indispensable because they believe we can find substitutes for essentially any resource that we might deplete or degrade.
a. True
b. False
Q:
Natural, human, and manufactured capital are the three types of capital used in most economic systems.
a. True
b. False
Q:
Stewardship is based on an idea that nature exists for all species alike and our success depends on how well we manage the earth and nature.
a. True
b. False
Q:
It can take 400 to 1,000 years to break down ____ that end up in landfills or the ocean.
a. disposable coffee cups
b. batteries
c. glass bottles
d. plastic bags
e. aluminum cans
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
Q:
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
Q:
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
Q:
The normally gradual change in species composition in a given area in response to changing environmental conditions is called ____.
a. background coevolution
b. intraspecific competition
c. inertia
d. ecological succession
e. commensalism
Q:
Clownfish usually live within sea anemones, whose tentacles sting and paralyze most fish that touch them. The clownfish, which are not harmed by the tentacles, gain protection from predators and feed on the waste matter left from the anemones meals. The clownfish protect the sea anemones from some of their predators and parasites. The relationship between clownfish and sea anemones is ____.
a. competition
b. carrying capacity
c. parasitism
d. mutualism
e. commensalism
Q:
A relationship in which one organism benefits by living on or in a member of another species, which is harmed by the interaction, best illustrates ____.
a. competition
b. predation
c. mutualism
d. parasitism
e. commensalism
Q:
You are an evolutionary entomologist. You have observed beetles that can raise their abdomens and give off a defensive chemical that generally repels predators. You discover a new species of beetle that raises its abdomen in a threatening way similar to the first species, but no defensive chemical is given off. You are most likely to characterize this defensive strategy as a form of ____.
a. camouflage
b. chemical warfare
c. mimicry
d. flight mechanism
e. warning coloration
Q:
Hawks typically forage for their rodent prey species during the daytime. While owls may eat similar prey species, and live in the same area, they forage during the night. This is best described as an example of ____.
a. interspecific competition
b. mutualism
c. parasitism
d. predation
e. resource partitioning