What of the following organisms is located only in the 3rd trophic level of the soil food chain?
a. bacteria
b. fungi
c. protozoa
d. nematodes

The correct answer is option - c. protozoa.

Explanation:

Amoeba and other protozoans are located at the third trophic level of the soil food chain. Nematodes are generally present in the second trophic level but sometimes in the third trophic level also.

Bacteria and fungi have a place in the second trophic level in the soil food chain. Amoeba engulfs bacteria for nutrition.

Thus, the correct answer is option- c. protozoa.

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.