Polar bears and grizzly bears share a common ancestor (similar to you and your cousin sharing a grandparent); Describe some selective pressures that may have caused speciation between these two types of bears.

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consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

well, i believe that the answer is 2. : 3