Yearly dental visits are a part of good dental hygiene because the dentist will check for cavities, fix them, clean your teeth very thoroughly (or whitening treatment), and check the progress and movement of your teeth. They can also recommend when dental surgery is necessary, for instance, if you have extra teeth that can be removed or when your wisdom teeth are coming in. Hope this helps! :)
Cells that do a similar activity join together to shape body tissue, for example, muscle, skin, or bone tissue. Gatherings of various kinds of cells make up the organs in your body, for example, your heart, liver, or lungs. Every organ has own must do, however all organs cooperate to keep up your body.
Well for one, we used coal for electricity, water for steam engines when they were much in use, natural fossil feuls for our gasoline and oil, and we use earths oxygen/nitrogen gasses to breathe and sadly we are polluting it at a fast rate
A shark's cardiovascular system flows in one loop, called the double circulatory system. Where as with mammals it is more like a tree, veins branching out from the heart and off other blood vessels.
