Select the correct answer. Which factor is difficult to assess in a cost-benefit analysis?
A.
product being used by everyone
OB.
the aesthetic value of nature
OC.
identifying internal costs
D. categorizing internal and external costs

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.