Here's why:

* Producers are organisms that make their own food through photosynthesis. They use sunlight, water, and carbon dioxide to create sugars (energy) for themselves.

* Plants are the primary producers in most ecosystems, including forests. They capture sunlight and convert it into energy through photosynthesis.

Other organisms in a forest ecosystem, like animals, fungi, and bacteria, are consumers because they rely on eating other organisms for their energy.