3. Which of the following will increase the rate at which carbon dioxide is being added to the Earth's atmosphere?
A An increase in the combustion of fossil fuels
B Humans planting trees in the Amazon forest
C An increase in the area of preserved forests
D Solar energy usage replacing use of fossil fuels

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the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

the correct answer is d