An antonym for "trophic level" could be "abiotic factor." While tropic levels refer to the hierarchical positions in an ecosystem based on energy flow and feeding relationships, abiotic factors pertain to the non-living chemical and physical components of the environment, such as climate, soil, and water, which influence living organisms.
the lower level
2.2
the bottom
Each tropic level is only able to use about 10% of the energy from its food. Because of this energy loss, there is usually not enough energy left to after a fourth tropic level to support anything higher.
the highest
lots
No
Roughly 10% of the energy from one trophic level is transferred to the next trophic level. This loss of energy occurs mainly through metabolic processes such as respiration and heat loss, resulting in less energy being available for the next trophic level.
Primary producer
Yes a tree does this.
the equator
Primary producer