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H Biology :D

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Across
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Loss of a species
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Increase in Earth's average temperatures due to increase in use of fossil fuels
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Variety of genes
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concentration of harmful substance increases as it is passed in the food chain
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mixture of chemicals in the air, gray haze
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Transport of organisms into new habitats, reproduce quickly, take over
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Where the population lives or "range"
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Is the movement out or decreases of the popualtion
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Is ruining homes of animals world wide
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Harvesting "fish" faster than they can reproduce
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The number of individuals the environment can support
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The movement in or rise of the population
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There are four parts of this word
Down
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Is the study based on countries
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The Study of human popualtion
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The amount of rain precipitation around the year
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any necessity of life
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The variety of organisms
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wearing away of surface soil
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The amount of individuals a area and the size of an area
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wise management of natural resources
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How many births, deaths and movement in or out
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Acidic rain