State one way insect pests in an apple orchard can be controlled without using chemical pesticides

One way to repel the insect pests in an apple orchard without using chemical pesticides is by planting marigold near it. Marigold contains a compound known as Pyrethrum. It produces a certain smell that even gardeners doesn't like. Pyrethrum is also one of the components in making insecticides.

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure

The hawk receives 0.1% energy from the caterpillar although the caterpillar gets eaten by another bird smaller than the hawk first