You can follow the flow of energy in an ecosystem by following its food or

blank #1: chain, process, or supply

blank #2: process, supply, or web

You can follow the flow of energy in an ecosystem by following its food chain or food web.

A food chain is a linear sequence of transfer of energy from one organism to the other when one organism being eaten by another organism. A food web is a interconnection of different food chain which are interdependent on each other for their energy supply. Both, food chain and food web can be useful in determining which organism is producer of energy and which is consumer of energy. Hence, these can be useful in determining the flow of energy in an ecosystem.

(75°f − 32) × 5/9 = 23.889°c