Final answer:
Chemotrophs are bacteria that require materials or chemical compounds from the environment to survive. They obtain energy by breaking down chemical compounds such as nitrogen-containing ammonia.
Step-by-step explanation:
Chemotrophs are a type of bacteria that require materials or chemical compounds from the environment in order to stay alive. They obtain energy by breaking down chemical compounds present in their surroundings. For example, some chemotrophic bacteria break down nitrogen-containing ammonia, which helps cycle nitrogen through the environment.