Which of the following is not a non-biodegradable material?

In the figure given alongside, the various trophic levels are shown in the form of a pyramid. At which trophic level the maximum energy is available?

One of the following is not a biodegradable material. This one is:

The use of one of the following will pollute the environment. This one is:

One of the following is not a consumer. This one is: