A trophic level is the position an organism occupies in a food chain. Each link in the chain represents one trophic level. On the land, the first trophic level begins with producers called

Primary Producers(Grass).

Explanation:

The photosynthetic organisms that make up the primary producers manufacture food using light energy from the sun and carbon dioxide and water too. In this process, the photosynthetic organisms transform the light energy into chemical energy. While in green plants, this process occurs in the chloroplast in leaves. It is also noted that only about half amount of the solar energy that falls on the leaf of a plant can be absorbed by chlorophyll and other pigments of photosynthesis. The plant also uses 30% of food energy for its own metabolic activities.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added