Final answer:
Mike can meet his vegan calcium needs by including green leafy vegetables like kale and turnip greens in his diet, and consuming calcium-fortified soy milk.
Step-by-step explanation:
Mike, who follows a vegan lifestyle, can obtain his calcium requirements in several ways that do not involve consuming dairy products. One of the best ways to meet his needs is through green leafy vegetables like kale and turnip greens, which can conveniently be included in a lunchtime salad. Additionally, fortified foods are a powerful source of dietary calcium, such as soy milk fortified with calcium. Whole grain bread, citrus fruits, and other plant-based items, such as nuts, seeds, and beans, do contain some calcium, but typically in smaller amounts.