Bacillus anthracis, the bacterium that causes the deadly disease anthrax produces thick endospores. what is the significant role of spore formation in the reproductive cycle of this bacterium?

The significant role of spore formation in the reproductive cycle of bacillus anthraces is that the formation of spores allows the bacillus anthraces to reproduce and disperse during very unfavorable conditions. Spores can remain viable in unfavorable conditions for long periods of time. Hope I helped :)

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.