49. Which of the following statements about energy flow is incorrect? (A) Only net primary productivity is available to consumers. (B) Only about one-thousandth of the chemical energy fixed by photosynthesis reaches a tertiary-level consumer. (C) Secondary productivity declines with each trophic level. (D) About 90% of the energy at one trophic level does not appear at the next. (E) Eating meat is probably the most economical way of acquiring the energy of photosynthetic productivity.