Erosion is caused by ice because of the freeze thaw weathering. It s naturally caused by water, wind, or gravity.
Nitrogen (3%) is found in many organic molecules, including the amino acids that make<span> up proteins, and the nucleic acids that </span>make<span> up DNA. Calcium (1.5%) is the most common mineral in the </span>human body<span> nearly all of </span>it<span> found in bones and teeth.
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Answer:
b. It keeps alveoli from collapsing with breaths.
Explanation:
Surfactants are highly surface active agents which are formed from a protein and lipid complex. It comprises of a hydrophobic and hydrophilic portion and its sole purpose is to control the tension at the air-liquid interface and thereby lower the surface tension. Surfactants are produced by the type II aveolar pneumocytes in the lungs.
Surfactants are needed in order to aid breathing and prevent straining oneself, it also prevents the lungs from collapsing during breathing, a term known as atelectasis.
c. increased energy level makes the most sense
