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5th grade NS Unit 2 Ecosystems
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How should we use natural resources?
in a fair and rational way
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What is the meaning of biotope?
non-living components
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What aims to guarantee the survival of people today and in the future?
sustainable development
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What is causing many ecosystems to deteriorate?
our current way of life
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What are the two different origins of an ecosystem?
natural and artificial
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What is causing imbalance in natural ecosystems?
many human activities
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How can we classify ecosystems?
By size, origin, the characteristics of the biotope
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What are three ways we alter ecosystems?
we overexploit resources, we distribute resources badly, we occupy, alter and pollute ecosystems
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What do we overexploit?
resources
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What are the three elements of ecosystems?
biotope, relationships. biocoenosis
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What are the three types of ecosystems?
aquatic, land and mixed
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What do we call the living things in an ecosystem?
biocoenosis
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What can destructive human activity lead to?
extinction of species
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How can we protect ecosystems?
By not wasting resources, not using up resources, and not destroying ecosystems.
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What is the meaning of extinction?
complete disappearance of a species
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