Final answer:
A reflex is a rapid and automatic motor response to a sensory stimulus that occurs without the involvement of the higher brain processes. Reflexes are also present in newborns, which aid in their survival.
Step-by-step explanation:
The subject of this question relates to reflex, which is a rapid motor response to a sensory stimulus. This type of response is typically instinctual and does not involve the higher thought processes of the brain. An example of a reflex is when a doctor taps below the kneecap causing the leg to extend automatically without conscious thought. Reflexes are seen even in newborn babies, demonstrating behaviors such as crying and sucking that are essential for their survival. These responses are crucial as they represent the nature aspect of development, showcasing the role of genes and biology in shaping our environmental responses.