Crossword Puzzle Ecology CrosswordOnline version ecology crossword by Benjamin D Morgan 1 Parts of the environment that are not living (2 words) 2 Any living part of the environment with which an organism might interact (2 words) 3 A system in which no matter is allowed to enter or leave. Energy CAN enter/leave 4 A biological community of interacting organisms and their physical environment. 5 System that allows matter in/out. Energy can enter/leave too 6 original source of almost all energy in most ecosystems 7 Comes from observations or data collected during an experiment 8 The study of how living things interact with each other and their environment 3 7 2 4 1 5 6 8