2. You don't want water to come out of the holes because it could change the flow of the water. You want the speed of the water fall to be different from each other without any fault. This could affect the accuracy of your experiment.

4. The straws will have a different flow rate because the size is different for each straw. The one with a bigger hole will have more liquid flowing at one time, while the smaller one will have less liquid.

7. Water stops flowing out of the cup at different times. The one with the larger straw lost liquid faster and the smaller one lost liquid slower. The flow rate will be different even though there is a different amount of liquid.

8. People with coronary heart diseases will have a slower flow of blood compared to those without diseases. Blood flows slower, making all the other organs move slower.

The heart rate is how fast your heart beats every second. The pulse rate tells us how many times our blood pumps every time you feel a heartbeat. Doctors check your pulse rate to see if your heart is healthy. There is a certain range and it may differ depending on the age of a patient, where you can see if you have a healthy heart. If the heart rate increases the pulse does too. It helps us to pump blood faster.

If we aren't able to consume enough oxygen, our body will become tired and eventually get sick. We will have trouble breathing due to lack of air.

When you exercise, you use up your energy. Even though we use up our energy, it gives the body a chance for blood to circulate faster and to stay more active. It helps keep a healthy heart because exercise moves different parts of our body.

I think of it as the lungs because they help the respiratory to systematize. They are the organs that allow us to exhale and inhale air.

Breathing is the physical process where the oxygen flows in and out from your lungs. Respiration is the process of oxygen being broken down, so the cells may be able to use them.