Why does the stain move across the slide when the paper towel is applied?

Apart of an ecosystem that can restrict the growth of a population is referred to as

What was the land like over 500 million years ago? what was under the sea?

Urgent in guinea pigs, black fur (b) is dominant over white fur (b). cross a heterozygous (hybrid) black guinea pig with a homozygous (purebred) white guinea pig. complete a punnett square, identify the genotype(s), phenotype(s), and probability (% and fraction) that the offspring will be black and white?