The answer your looking for is B different patterns of gene expression
Answer:
C. when an origanism changes tropic levels to look like another organism
Water<span> issuing from a </span>hot spring<span> is heated geothermally, that is, with heat produced from the Earth's mantle. ... The rate of temperature increase with depth is known as the geothermal gradient. If </span>water<span> percolates deeply enough into the crust, it will be heated as it comes into contact with </span>hot<span> rocks.</span>
Answer:
volcanic eruption and solar variation
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It's both B.They can never be depleted and C.They are replaceable by natural means.