In the united states, what material is least likely to be recycled?

The material that is least likely to be recycled is the PET plastic or also known as the Polyethylene terephthalate plastics that are used in beverages or condiments. It is because though it is convenient and could be recycled after using, the residue that is left in it is hard to remove, making it difficult, time consuming and expensive to be recycled that is why it is least likely to be recycled.

the answer will be a) proteins i believe

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.