<span>The option which is responsible for the exchange of gases in a leaf is D. the stomata. Stomata are tiny pores in leaves that enable the flow of gases throughout a plant. The phloem transports sugar, spongy is an adjective referring to something that resembles a sponge, and mesophyll is the part of the leaf that contains chloroplasts.</span>
In 20 years, many of the country's 411 national parks, monuments and historic sites will suffer damage as sea levels rise, wildfires rage, glaciers melt and iconic wildlife, such as grizzly bears in Wyoming and pikas in Colorado's high-altitude tundra face shrinking habitat and scarce food.
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