Teach your students everything they need to know about blood with this engaging, age-appropriate science resource designed for grades 3 to 5. This printable packet explores the four main components of blood: red blood cells, white blood cells, plasma, and platelets—and explains how blood moves through the body, fights infection, carries oxygen and nutrients, and helps heal wounds. This resource is perfect for your human body unit, health and biology lessons, or science centers. It inclu