Biotic refers to all living things.
Answer: Thalamus
Explanation:
The thalamus part of the brain is known as the relay station for all the sensory information. This information can be any sought of smell, light, taste et cetera.
It is relayed further via thalamus. Myelinated fiber bundle originates from the lateral surface of thalamus and it terminates at the cerebral cortex.
It is a relay station for the information from brainstem, spinal cord and cerebrum towards the cortex.
The nutrients get to the cells in a flatworms solid acoelomate body by diffusion process. Flatworms feed primarily on protozoa and bacteria, smaller worms and tiny organisms, dead or alive, that they come across. Based on the species of the flatworms , they also consume plant materials. They rely on diffusion to transport oxygen and nutrients to their internal tissues.