Arrange in two layers, called the phospholipid bilayer. Phospholipid molecule has a head, and two tails. The head is hydrophilic (it likes water) and the tails are hydrophobic (phobic meaning it has a phobia of water, or in simple words, hates water).
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Lose weight: To lose weight, caloric input needs to decrease, and caloric output needs to increase?
Gain weight: To gain weight, caloric input needs to increase, and caloric output needs to decrease.
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Educate yourself about the needed safety tools before taking part and make sure to be aware when you're doing it