Biodiversity
When number of deaths of an organism exceeds births until the organism completely disappears
Extinction
Humans depend on plants and animals to provide food clothing energy medicine and shelter- An example of
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Direct economic value
An event in which a large percentage of all living species become extinct in a relatively short period of time
Mass Extinction
Materials and organisms found in the biosphere such as minerals, fossil fuels, nuclear fuels, plants, animals,soil, clean air, etc.
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Natural Resources
Eutrophication means ?????
when fertilizers, animal waste, sewage, or other substances rich in nitrogen and phosphorous flow into waterways, causing excessive algae growth.
The variety of life in an area determined by the number of different species in that area
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biodiversity
A plant used for food, such as corn or soybeans lacking resistance to disease is an example of a lack of what?
Genetic Diversity
The gradual process of species becoming extinct
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Background extinction.
The current rate of extinction is increasing due to excessive use of species that have economic value, known as
Overexploitation
When fossil fuels are burned, what pollutant enters the oceans?
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Acid precipitation
The variety of genes or inheritable characteristics present in a population
Genetic diversity
Many important medicines come from what? Many future medicines may also come from these.
Plants - A wide variety is important for having many different medicines.
When did the Cretaceous Period extinction occur? Why did it occur?
65 MYA, Asteroid strike
The number one reason species go extinct today
Loss of habitat.
What does biological magnification refer to?
The increasing cancentration of toxic substances in organisms as trophic levels increase in a food chain or food web.
The number of different species and relative abundance of each species in a biological community
Species Diversity
In general, what is cheaper, man made technology to perform important ecological processes, or allowing nature to perform these tasks?
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Nature can do them cheaper.
60 percent of mammals have become extinct in the last 500 years, where did they live?
On islands.
When habitat is destroyed or disrupted animals will do one of two things usually
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Relocate or die
Species that can significantly modify or disrupt a habitat, an introduced species
Invasive species
The variety of ecosystems present in the biosphere
Ecosystem diversity
Studying the environment and preserving biodiversity can have what effect?
Helping human population- we are part of the ecosystem, Improve quality of life (recreational value), improve aesthetic value, etc.
What can carry new diseases to populations of animals, wiping them out?
Invasive species
One species that plays a particularly large role in an ecosystem
Keystone species.
Using resources at a rate at which they can be replaced or recycled while preserving long term environmental health of the biosphere.
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Sustainable use.