[Q]: - The sound waves hit an object - Echoes are produced - The echo returns to the bat's ears - The bat hears the echo - The bat can figure out where the object is located. What might be the first step of the process?
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[A]: The bat sends out sound waves from their mouth or nose

[Q]: - The air goes down the esophagus - The air moves into the lungs - The carbon dioxide is removed - The remaining oxygen enters the body - The remaining carbon dioxide is expelled through the mouth. What might be the first step of the process?
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[A]: Air is drawn in through the mouth

[Q]: - Babies become infants - Infants become children - Children learn skills - Children become teenagers - Teenagers undergo puberty - Teenagers become adults - Adults have children - Adults become elderly - Elderly humans die. What might be the first step of the process?
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[A]: Humans are born as babies

[Q]: - Sediment builds up over the remains - The remains decompose, leaving only trace amounts - The remaining parts over the years are replaced with mineral - A fossil is formed - What might be the first step of the process?
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[A]:
Animals and plants die in soft soil or mud