Explain how endospores have allowed some bacteria, like tetanus, to be a successful species.

Endospores allow Clostridium tetani (causative agent of tetanus) to survive harsh conditions in the environment.  Because tetanus is an obligate anaerobe, oxygen is a harmful environmental factor. Endospores also allow the bacteria to resist desiccation (drying) and high temperatures.  

The bacteria can be dormant as endospores until they are in favorable conditions.  At this point, they will germinate into vegetative cells where they will be able to reproduce until conditions become unfavorable and they form endospores again.

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