Uring this period he became acquainted with Osama bin Laden, a wealthy Saudi who had joined the Afghan resistance to the Soviets,
The answer is studying for a test because you want to feel proud of your performance. Intrinsic motivation means you do something for the sake of your internal feelings/motivation, not based on something or someone external like a paycheck or significant other.
The answer ahould bbe A: cuz the sound wave itself has no defend to water and travel!!
Explanation:
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The answer is D. Because the bird has to be noticed and the brighter the feathers the more likely the chance to be noticed.