In an ecosytem, there is floe of energy at differgy trophic levels.this is as follows
A. Primary consumers - Tertiary consumers - Secondary consumers - Decomposer-Producers
B. Producers - Primary consumers - Secondary consumers - Tertiary consumers - Decomposers
C. Producers - Decomposers - Primary consumers - Tertiary consumers-Secondary consumers
D. Producers-Primary consumers-Tertiary consumers - Secondary consumers-Decomposers