aim 47 abiotic biotic and levels filled.notebook 1 April 19, 2017 study of the environment and how organisms interact with each other and their surroundings incapable of carrying out 1 or more life function carrying out almost all life functions and able to maintain homeostasis Plants (biotic) need sunlight and CO2 (abiotic) to make food Animals (biotic) need oxygen (abiotic) to make energy