The organisms at the beginning of a food chain are

Variety of living organisms; includes genetic, species, and ecological types.

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist