Which of these belongs to a trophic level that receives energy directly from the initial source?

Producers belongs to a trophic level that receives energy directly from the initial source.

Explanation:

Producers are the organisms which recieves energy directly from the initial source i. e. sunlight and make their own food from the process of photosynthesis. Producers are the plants which are autotrophic in nature. The organisms which feed on producers is known as primary consumers. Examples of primary consumer are cow, sheep and deer etc.

b. read the phase at the intersection of any given temperature and pressure.