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.
What percent of the trees cut down are used for something other than paper?a.35%b.45%c.55%d.65%
Compare the relationship of trees with other plants and with insects.
Trees compete with other plants for sunlight, water, and nutrients. In contrast, many insects depend on trees for food and shelter, while some insects pollinate trees or help control pests, creating mutualistic relationships.
What percent of the trees cut down are used for something other than paper?a.35%b.45%c.55%d.65%
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.
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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