Which type ir organism converts wastes and dead materials into nutrients that can be used by plants

The answer is Decomposers.

If I assume correctly you r talking about different types of consumers. The type of consumers you r referring to are called decomposers.

examples include bacteria, worms, insects, and vultures

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.