The primary source of energy in most ecosystems is/are

The Sun.

Explanation:

Energy reaches the Earth in the form of electromagnetic radiation.

Terrestrial solar radiation means solar radiation that reaches the Earth after passing through the Earth's atmosphere. About 97% of solar radiation reaches the Earth in the range of wavelengths 0.29 - 2.5 μm, and about 3% with wavelengths greater than 2.5 μm.

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )