Explain how wildfires stimulate plant reproduction?

Fire initiates critical natural processes by breaking down organic matter into soil nutrients. ... If enough fuel builds up, the fires could be so intense that they may destroy the seeds in the soil and hinder new tree and plant growth.

A fire turns dead trees/decaying trees into ash which nutrients return to the soil.

The answer is: beans and whey protein

The most abundant element in the atmosphere is nitrogen N2 (~78%), followed by oxygen O2 (~21%).

CO2 makes up less than 1% of the atmosphere. Much less for that matter.

The key to the question is knowing that protein contains nitrogen.

Protein is a macromolecule made up of smaller molecules called amino acids. Amino acids are made up of a central carbon (C) and 4 groups:
     amine (-NH2)
     carboxylic acid (-COOH)
     a hydrogen (H)
     a side chain which is different and specific to each amino acid

One can infer amino acids contain nitrogen from their name (amino).

Beans contain a high amount of protein, and whey protein is a type of protein, so both contain nitrogen.