What must happen in a species for it to evolve? (put each of the four factors of evolution in your own words)

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.

Which body region are part of the cephalic region?

What happens to the amount of waste in the pond as the ecosystem ages?