Answer:The North frigid zone, between the Arctic Circle 66.5° N and the North Pole 90° N. Covers 4.12% of Earth's surface. The North temperate zone, between the Tropic of Cancer 23.5° N and the Arctic Circle..
Explanation:
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<span>Switching genes on and off.</span>
Answer:
Submergent plants are totally submerged, with all parts growing under water. Floating plants are not rooted like emergent or submergent plants. They float along the water's surface instead.
Explanation:
The answer is carbon dioxide. <span> A greenhouse gas is a gas in the </span><span>atmosphere that </span>absorbs<span> and </span>emits radiant energy from the sun, thereby causing a 'greenhouse' effect. These gases are fundamental to life on Earth, as without them<span>, the average temperature on </span>Earth <span>would be around −18 °C </span><span>rather than 15 °C. However, a problem arises when there is too much greenhouse gas in the atmosphere, and the warming effect becomes too strong, leading to global warming.</span>
