Hello there!
It would be B. Second degree.
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We can conserve resources by recycling objects that are able to be recycled like, plastic water bottles and paper. We can also purchase reusable products, such as a reusable water bottle, or we can write on both sides of our paper instead of one. We can also reduce, by buying and using less stuff.
The lungs recoil to force the air out of the lungs. The intercostal muscles relax, returning the chest wall to its original position. The diaphragm also relaxes, moving higher into the thoracic cavity.
