Sulfuric acid is a. involved in bioleaching. b. produced by unicellular sulfur-oxidizers. c. produced by lactobacillus. d. a result of reduction of metal sulfides. e. involved in bioleaching and produced by unicellular sulfur-oxidizers.

Option E, involved in bioleaching AND produced by unicellular sulfur-oxidizers.

Explanation:

Sulfur-oxidizing bacteria (both unicellular & colorless) are responsible for oxidizing the inorganic compounds thereby producing sulfuric acid. when bacteria and fungi are used for extracting pure inorganic substance from its raw ore, then this process is called bio leaching. The net product of any such process in most of the cases is the pure metal in form of sulfate and sulfuric acid.

Option E is correct.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.