Which part of the brain is responsible for controlling movement and body temperature?

The correct answer is the brain stem, which plays a crucial role in controlling vital functions of the body including movement and body temperature regulation. The brain stem acts as a relay center connecting the brain and spinal cord, facilitating communication between different parts of the nervous system. It is responsible for autonomic functions, such as heart rate, breathing, and the regulation of body temperature, which are essential for maintaining homeostasis.

The cerebrum is primarily involved in higher cognitive functions like thinking, memory, and sensory processing rather than directly controlling basic automatic processes, although it does influence voluntary movement. The cerebellum is mainly responsible for coordination and balance of movement, enhancing fine motor control, but does not regulate body temperature. The limbic system is associated with emotions, memory, and arousal, but it does not directly control motor functions or thermoregulation. Thus, the brain stem is the key region responsible for the essential tasks mentioned in the question.