Assuming each of the other 24 students also inhales and exhales at a normal volume and rate, on average how many virus particles would each student inhale/breath by the end of the lecture period?

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.

Amutation is basically the change in the gene, caused by alteration of single based units in the dna, or the genes or chromosomes were rearranged in the dna