U Question 4 0.5 pts Most materials stay in roughly the same concentration as they move from one trophic level to the next, but some do not. What characteristic best indicates that a particular material is likely to increase in concentration as it moves from producers to tertiary consumers? Q The material returns to the environment from living tissues very slowly. O The material ows back into the environment from living tissues very quickly. 0 The material is only toxic at very high concentrations in living tissues. 0 The material is never incorporated into living tissues. Question 5 0.5 pts Which of the following processes is characteristic of most autotrophs, and lacking in all consumers [primaly secondary) etc)? 0 Mitosis Q Aerobic cellular respiration O Meiosis O Photosynthesis Question 6 0.5 pts In the example provided in the reading. which process accounts for most of the difference between gross production and net production, regardless of trophic level? 0 Organismalgrowth Q Photosynthesis 0 Cellular Respiration O Digestion