<human>:  I have a question about the Biological basis of intelligence. Why do we have a brain?
<bot>: The brain is a very complex organ. It is the organ that is responsible for all of our thoughts, feelings, and actions. It is the organ that allows us to think, feel, and act. The brain is made up of billions of cells, called neurons, that are connected to each other by synapses. The brain is also made up of many different types of cells, including neurons, glial cells, and other types of cells.