Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

Organisms of a higher trophic level which feed on several types of organisms belonging to a number of lower trophic levels constitute the :

What type of organisms belong to T_1 and T_2 trophic levels of food chain ?

Which type of organisms belong to T_1 and T_2 trophic levels of food chain?

Which organisms constitute the last trophic level ?

What is the difference between the food habits of organisms belonging to the first and the third trophic levels ? Give one example each of the organisms belonging to these two trophic levels.

Organisms at a higher trophic level have less energy avilable. Comment.