Sir Isaac Newton, held the theory that light<span> was </span>made<span> up of tiny particles. In 1678, </span>Dutch<span> physicist, </span>Christiaan Huygens<span>, believed that </span>light<span> was </span>made<span> up of waves vibrating up and down perpendicular to the direction of the </span>light<span> travels, and therefore formulated a way of visualizing wave propagation.</span>
The decreased carbon dioxide concentration inside the leaves and the increased leaf temperatures favour the wasteful process of photorespiration.
The correct answer is: [D]: "receives venous blood from the lower extremity" .
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<h2>Answer:</h2>
<u>The objects that allow humans to access ground water are:</u>
- <u>A spring</u>
- <u>a well drilled into an aquifer
</u>
- <u>a well drilled below the water table</u>
<h2>Explanation:</h2>
Access to ground water can be gained if we dig a well or use any source that can provide us an access below the water table. A water table is the level below which the ground is saturated with water. So above the saturation level we cannot gain access to water therefore we must go below it. A spring springs from ground below water table and the same thing occurs for well or an aquifer if it is below the water table..
<span>B) He noticed four-fifths of the air had been used up. If by air this question is referring to oxygen, the fact that it has been used up means it has reacted, mean a substance has combusted.</span>
