What causes darkening of the skin as melanin production increases

Why is pollen needed in plant reproduction? A. fertilization takes place in the pollen B. pollen contains the egg cell C. pollen contains the sperm cell D. egg cells stick to pollen

Is Cream cheese a saturated fat or unsaturated fat

What evidence suggests the continents were once all together but then drifted apart?

Evolution states that Humans evolved from Monkeys and Gorillas True or false? If true give a reason why if false give a reason why

Why is DNA replication called "semi-conservative"?

What must happen before the cell can go through mitosis? Interphase.

Belle's grandfather lives in a region where the temperature drops below 0*F at night. When belle visited her grandfather, they hiked up a hill. Belle noticed that a lot of rock had cracks in them.

The genetic condition of an organism that has two identical alleles for a given trait.

Which level of biological classification is the lowest level that butterflies

What might happen if a continent stops rifting apart?