What is an atrial and ventricular contraction?​

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the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.

genetic variation will increase because of a new habitat and food source.

explanation:

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher