When people train to become doctors, they need to study different parts of the body, choose a part(s) of the body and label it, gaining an understanding of how it works (e.g. heart, ear, eye).
Farmers work hard to provide us with many different types of food. Look into how milk gets from the cow to your local shop! Draw and label this process.
Horticulturalists and gardeners ensure we have plenty of trees and plants in our environment (which is important for wildlife) and also make our local area look attractive. Identify a plant in your local park and draw and label its life cycle,