Exam 3: Biodiversity and Evolution

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The number or variety of species in an area is called

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Individuals,not populations,evolve to become genetically different.

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Deserts are primarily located in the hot,tropical regions.

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All of the following are marine life zones except

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A early population of fish migrate to two different areas in search of food and become isolated.The fish in each area evolve to a point where they can no longer interbreed. This process is called ____________________.

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  -On the temperate-zone lake figure,choose the zone primarily inhabited by invertebrates,such as decomposers,that can live in the low oxygen. -On the temperate-zone lake figure,choose the zone primarily inhabited by invertebrates,such as decomposers,that can live in the low oxygen.

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Geographic isolation and reproductive isolation are the only two processes that affect the number and types of species on Earth.

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Which of the following results in the loss of the most species?

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Distinguish genetic engineering from artificial selection.

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Why do rivers and lakes support different life zones?

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Natural selection can only occur if a heritable trait can be passed on to offspring at a higher rate than other individuals in a population.

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Difference in genes among organisms of the same species is called

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The twilight (dimly lit)zone of the sea is the

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What are the two most important factors determining the climate of an area?

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Tectonic plate movements,volcanic eruptions,and earthquakes can cause the extinction of existing species.

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Deciduous forests are found in temperate regions while coniferous forests are found in sub-polar regions.

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Mutations can be caused by all of the following except

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The variety of Earth's species and ecosystems is called ____________________.

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Biomes are affected by ocean currents and water flow.

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Briefly explain why desert ecosystems are particularly fragile.

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