different between explains vs tells

explains

explains From the web:

• what explains the shape of a demand curve
• what explains why the constitution was written
• what explains why the renaissance began in italy
• what explains how the particles in gases behave
• what explains the similarities in the pacific cultures
• what explains the existence of analogous structures
• what is the shape of demand curve

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tells

tells From the web:

• what tells a ribosome how to assemble a protein
• what tells your cells what to do
• what tells the hardware what to do and how to do it
• what tells the story of a chemical reaction
• what tells the heart to beat
• what tells the ac compressor to turn on
• what tells you population density
• what tells the ribosome to start