Final answer:
Vegans can obtain the necessary protein by combining different plant sources to get all essential amino acids.
Step-by-step explanation:
Vegans, who do not consume any animal products, including meats, eggs, and dairy products, can still obtain the protein their cells need to grow by combining different plant sources to get all essential amino acids. While specific plant foods do not contain all the essential amino acids, vegans can consume a variety of plant proteins throughout the day to ensure they get all the necessary amino acids for protein synthesis.