Ecology and Human Impact

In an ecosystem, the presence of many different species is critical for the survival of some forms of life when

• Ecosystems remain stable over periods of time

• Significant changes occur in the ecosystem

• Natural selection does not occur

• The finite resources of Earth increase

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Decomposers are important in the environment because they

• Convert large modules into simpler molecules that can be recycled

• Release heat from large molecules so that the heat can be recycled through the ecosystem

• Can take I carbon dioxide and convert it into oxygen

• Convert molecules of dead organisms into permanent biotic parts of an ecosystem

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In some areas, foresters plant one tree for every tree they cut This activity is an example of

• Lack of management of non renewable natural resources

• A good conservation practice for renewable natural resources

• A good conservation practice for non renewable natural resources

• Lack of concern for renewable natural resources

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An environment can support only as many organisms as the available energy, minerals and oxygen will allow. Which term is best described by this statement

• Biological feedback

• Carrying capacity

• Homeostatic diversity

• Biological diversity

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In a forest community, a shelf fungus and a slug live on the side of a decaying tree trunk. The fungus digests an absorbs materials from the tree, while the sung eats algae growing on the outside of the trunk. These organisms do not compete with one another because they occupy

• The same habitat, but different niches

• The same niche, but different habitats

• The same niche and the same habitat

• Different habitats and different niches

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If humans remove carnivores predators such as wolves and coyotes from an ecosystem, what will probably be the first observable result?

• The natural prey will die off

• Certain plant populations will increase

• Certain herbivores will exceed caring capacity

• the decompress will fill the predator niche

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In an ecosystem, nutrients would be recycled if they were transferred directly from herbivore to carnivores to

• Hosts

• Prey

• Decomposers

• Autotrophs

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Imported animals species often distrust often disrupt an ecosystem because in their new environment, they wil most likely

• Eliminate the fetid variation of autotrophs

• Increase the number of mutations in the herbivores

• Have no natural enemies

• Be unable to produce offspring

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