How does the transfer of information or stimuli from the environment to the central
nervous system happen?

Synapses form between the neurons, allowing them to communicate to other neurons or other systems in the body. The general flow of information is that the peripheral nervous system (PNS) takes in information through sensory neurons, then sends it to the central nervous system (CNS) to be processed.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.