Question

The only organisms that can occupy the first trophic level are the

The secondary consumers because they consume the energy from the producers and the primary consumers.
The tertiary consumers because they are the highest in the food chain
Primary consumers because they are the first to pass on the energy
The producers because they transfer the energy from the sun into a usable form for all living things

Answer 1

The producers because the energy they transfer is energy they gathered from the sun.