Question: What is the missing first step of the following process:  -  Enters the lungs - The oxygen fills the sacs in your lungs - Carbon dioxide is removed from the lungs and exhaled - The oxygen is pass throughout your body.
Answer: Air is taken through the mouth

[Q]: What is the missing first step of the following process:  -  Through erosion, the stream cuts into the soil and bedrock - Through continuous erosion, a deep gash is cut through - After many years the river may dry up - A dry ravine is left -
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[A]: A stream or river must occur

input: Please answer the following: What is the missing first step of the following process:  -  Two types of proteins exist in filaments in the muscles - The filaments move when the brain instructs them to - The motion of the filaments cause the muscle to shorten and contract - Opposing pairs of muscles exist in order to provide the necessary range of motion.
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output: Electrical signals in the brain travel through nerves to muscles

Please answer this: What is the missing first step of the following process:  -  May come from different sources - The gases remain trapped in the atmosphere - Through the suns light the gases hold in heat and energy - Trap them in our atmosphere - The earth may become warmer this way.
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Answer: Several types of gases form in the atmosphere

Problem: What is the missing first step of the following process:  -  The sound waves hit an object - Echoes are produced - The echo returns to the bat&#x27;s ears - The bat hears the echo - The bat can figure out where the object is located.

A: The bat sends out sound waves from their mouth or nose

input: Please answer the following: What is the missing first step of the following process:  -  Falls onto the ground - The acid rain starts scouring rocks - Destroys vegetation - The lack of vegetation alters the surrounding environment.
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output:
Acid rain is produced by chemicals that reach into the atmosphere