What causes burning rock and gas to explode out of a volcano?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?

This rapid change in species that rarely leaves behind fossil evidence is referred to as