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Answer:
its "A" water flowing over a tall cliff
Explanation:
Involuntary, meaning things in the body such as your heart is all regulated to act unconsciously while also receiving directives from the brain.
A membrane lipid is a compound which belongs to a group of (structurally similar to fats and oils) which form the double-layered surface of all cells (lipid bilayer). The three major classes of membrane lipids are phospholipids, glycolipids, and cholesterol.
heeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee sorry person