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.
Answer:
Increased fitness of large-beaked birds, leading to natural selection
(Why: Birds with larger beaks are better able to survive in the new enviornment)
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