a spiral ending in a serpent head
Your answer is C
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The gas we need to breathe in is oxygen
Explanation:
At one end of a contour the slope of the land will always be steeper than at the other. Thus when plowing parallel runs paralleling any contour the plow furrows soon deviate from a true contour. Rain water in these furrows will thus flow sideways along the falling "contour" line.
Answer:
Photosynthesis and respiration