Answer and Explanation:
False.
Chemosynthetic bacteria living in the pore spaces within rock and sediment in the aphotic zone are not called extremophiles. Extremophiles are organisms that can thrive in extreme environments with high or low temperatures, extreme pH levels, or high pressures.
The bacteria you mentioned, which use chemosynthesis to obtain energy from inorganic molecules, are commonly referred to as chemolithoautotrophs or lithotrophs. These bacteria obtain energy by oxidizing inorganic substances, such as hydrogen sulfide or methane, rather than sunlight like photosynthetic organisms. They can be found in environments such as hydrothermal vents, deep-sea sediments, or underground caves where sunlight is absent.
While these bacteria are capable of surviving in challenging and unique environments, they do not necessarily meet the criteria to be classified as extremophiles.