<span>The visual cliff is a laboratory device for testing <u>depth perception</u> in infants. This device is basically an apparatus that resembles a cliff, on top of which a child is placed so as to check its perception of depth from the cliff to the bottom of it. This is important so as to check whether the child has visual or motor problems. </span>
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The practice of leaving the Stalks of crops in the grouns is known as <span>no-till farming.
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Answer: Light energy, water, carbon dioxide
