#### Which of the following best describes an ecosystem? 1. [x] A group of interacting organisms of different species living in a specific area 2. [ ] The process of energy transfer within a single species population 3. [ ] The study of individual organisms in a habitat 4. [ ] The physical environment in which organisms live #### What term describes the process by which energy flows through an ecosystem from producers to consumers? 1. [ ] Biomagnification 2. [ ] Photosynthesis 3. [ ] Trophic cascade 4. [x] Food chain #### Which of the following best describes a food web in an ecosystem? 1. [ ] A linear representation of energy flow from producers to consumers 2. [ ] A diagram showing the flow of energy and nutrients in a single direction 3. [x] A complex network of interconnected food chains 4. [ ] A hierarchical structure showing the trophic levels in an ecosystem #### What term describes the part of Earth and its atmosphere where life exists? 1. [ ] A diagram showing the flow of energy and nutrients in a single direction 2. [ ] Hydrosphere 3. [ ] Geosphere 4. [x] Biosphere #### Which of the following best describes a food web in an ecosystem? 1. [ ] A linear representation of energy flow from producers to consumers 2. [ ] A diagram showing the flow of energy and nutrients in a single direction 3. [x] A complex network of interconnected food chains 4. [ ] A hierarchical structure showing the trophic levels in an ecosystem