Final answer:
The olfactory system does not have a critical period because it retains the ability to grow new neurons and adapt throughout life unlike the visual or language systems that have well-defined developmental windows for learning and sensory processing.
Step-by-step explanation:
The question asks which sensory system does not have a critical period. Critical periods are developmental stages during which the brain is particularly receptive to certain types of learning and sensory information. some systems, like the visual and language systems, have well-defined critical periods. For instance, the visual system has a critical period early in life during which it is crucial for the individual to receive proper visual stimulation to develop normal vision. Similarly, language acquisition has a critical period, where learning a language is significantly easier and more natural.
Among the options provided, the olfactory system is known for not having a critical period in the same way visual or language systems do. while the olfactory system can improve and adapt based on experiences, it does not have a strict developmental window that limits when these skills can develop. Research suggests the olfactory system has the ability to grow new neurons and retain plasticity throughout life.therefore, the answer to the question 'Which system does not have a critical period?' is A. Olfactory.