Students in Ms. Brown’s class are on a field trip at the zoo. They observe the following biotic and abiotic factors in the zoo:

Rocks
Water
Trees
Grass
Monkeys
Birds

Ms. Brown would now like them to make a list of all the factors in the zoo ecosystem. Which of the items should be included on their list?

trees and grass
monkeys and birds
rocks, water, and trees
All abiotic and biotic factors of the zoo are part of the ecosystem.