Bacteria that use chemicals like sulfur as an energy source are considered
a. photoautotrophs.
b. heterotrophs.
c. saprobes.
d. chemoautotrophs.

Bacteria that use chemicals like sulfur as an energy source are considered as chemoautotrophs. Chemoautotrophs are the organism that derives energy and from inorganic substances such as sulfur, ammonia etc. These organisms are most commonly found in extreme and hostile environments such as the deep sea vents where there is not enough sunlight and hence the primary producers (chemoautotrophs) depends on the inorganic energy sources.An example of such bacteria is Paracoccus.

From our previous experiment, we examined how many drops a penny can hold - and place drops of salt water on the penny after recording 5 trials each, take the average of each solution.