How can people be twins but one is black and the other is white

Which process involves the movement of molecules or atoms down a concentration gradient across plasma membranes?

What was the neolithic revolution and how did it change life

How long ago did speciation occur between tarsier and the ancestor of all the anthropoids?

Why did the population of deer increase during the wolves absence? a Humans planted more plants in the area b Their predators were gone c The deer switched from asexual to sexual reproduction d Rivers brought more fish to the area

If high tide comes in at 1:00 PM on Monday, what time will high tide come in on the next day (Tuesday) ?

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain

How do enzymes catalyze chemical reactions (don't just say "they lower the activation energy", give me specific mechanisms) ?

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.