Final answer:
The correct answer to the characteristic feature of a living thing is Reproduction (A). Reproduction is a fundamental characteristic of life, essential for the continuation of species, and can occur through asexual or sexual means.
Step-by-step explanation:
A characteristic feature of a living thing is the ability to process. The correct answer is A) Reproduction. All living things are capable of reproduction, which is the fundamental process by which organisms produce offspring. Reproduction can range from simple cell division in unicellular organisms to more complex forms of reproduction in multicellular organisms like humans and animals. It is one of the defining characteristics of life, alongside metabolism, growth, response to stimuli, maintenance of homeostasis, and being composed of cells.
Reproduction ensures the perpetuation of a species and can occur through various mechanisms, such as asexual reproduction or sexual reproduction. In asexual reproduction, an organism can reproduce without the need for another organism, whereas sexual reproduction typically involves the combination of genetic material from two parents to produce genetically unique offspring.