It is where organisms have become better adapted to the environment, thus produce offspring.
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Carbon is a essential element for all life on earth. The primary function of the the Carbon Cycle is to exchange carbon throughout earth between the atmosphere,oceans,ecosystems, and geosphere. If the Carbon Cycle was to fail, then life on earth would begin to breakdown causing an end to all life on earth.
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Answer:
this would be an analog signal as is a constant movement of sound and light waves.
Explanation:
digital signal is more of measuring current and voltage in a circuit
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The answer is :
D. The formation of a receptor-ligand complex.
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The skeletal system, as it is necessary to support the body, protect internal organs, and allow for the movement of an organism.