What is true of the energy that is passed from one trophic level to the next in a food chain?

The real answer to this question is about 10% of the stored energy of one level becomes stored energy at the next level higher.

Think about it, when a consumer eats the producer it also consumes the energy the producer stored and as the food chain grows the energy is passed through all. The only time the energy is released into heat is when a consumer dies and decomposes, and even then all of the energy isn't released.

Also took the quiz

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.