The receptor cells of nervous system sense the changes in internal and external environment and send the information to the central nervous system (brain and spinal cord). The brain process the information and commands the muscles or effector organs to carry out required processes or functions under prevailing conditions. This makes the organisms to respond to the changes in internal and external environment.
A phenotype is the physical appearance of a trait in an organism, which may be influenced by the organism's experiences. ... A phenotype is an organism's allele combination. A genotype is the physical appearance of a trait in an organism, which may be influenced by the organism's experiences.
