Surprisingly, whales have hind limbs (leg bones) that they do not use, but that are thought to be left over from an earlier ancestor of theirs. This is an example of which type of structures?

answer; 60-100; beats per minute

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

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.

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