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Cards In This Set
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The demographic transition refers to a countrys change from
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High birth rates to low birth and death rates
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A demograph transition is expected to accompany
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Economic development and stableization
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What is the dependency ratio
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The number of non-working compared with working individuals in a population
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The location of specific biodomes can be predicted based on
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Precipation and tempture
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Historically, the greatest threat to grasslands had been
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Converion to farmland
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In contrast w/ the _______, the soil of the _______is more nutient-rich and this type of biome has fewer incects parasites and fungal disease, therefore, in many places these are hightly endangered
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Tropical rainforest (the soil of the) tropical seasonal forest
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One biome type that has been as badly threatened as other biomes is
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Artic tundra
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We are usually referring to species diversity when we talk about biodiversity, however, genetic diversity is also important to ecological sysytems because diverse genes
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Are neccessary for population too evolve in a changing environment
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Ecology diversity is a measure of the number of
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Niches, tropical levels, and ecological process of a biological community
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Approximatly how many species have been identified on earth
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1.7 million
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Most of the species that are yet ubdiscovered are probably
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Invertebrates
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Species diversity is most concentrated in
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South america, africa and southeast asia
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Habitat fragmentation usually leads to a
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Decrease in biodiversity
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Which ot the following is true
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Humans may have been causing extincting thousand of years ago, but our impact has recently increased
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The main reason for the current high rate of animal extenction is
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Habitat destruction worldwide
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