How do trees improve water quality?a.Tree roots anchor soil in place, preventing runoff.b.Water is filtered as it passes through the root systems of trees.c.An adult tree can store nearly 250 gallons of water.d.All of the above
Explain how trees help maintain air quality.
Trees absorb carbon dioxide and release oxygen through photosynthesis. Their leaves also trap dust, pollen, and airborne pollutants, helping to clean the air.
Which of the following statements about human impact on trees is true?a.Human activity always has a negative impact on trees.b.All human uses of trees require destruction of the trees.c.Human activity has had both a positive and negative impact on trees.d.Cutting down trees is the only activity that has a negative impact on trees.
Explain how biopharmaceuticals can be created using plants.
Scientists can insert genes into plants so that the plants produce useful medical compounds such as vaccines or proteins used in drugs; these compounds can then be extracted from the plant material.
How has human use of trees had both a positive and negative impact?
Human use of trees provides resources such as wood for building and paper, and supports economies, but has also caused deforestation, loss of habitats, and increased carbon dioxide levels.
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