I’m confused on this part of my biology homework can anyone me understand it?

1. watermelon, papaya, oranges, bananas, and lemons are included in this food group. vitamin c 2. you need 6 or more servings of this food group each day vitamins d and a 3. found in fruit and keeps blood vessels healthy calcium 4. vitamins found in milk bread and grain 5. a mineral that strengthens bones fruit

Number and variety of living organism; includes genetic, species, and ecological types

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?