The scientific term for any perceivable feature of a living organism is phenotype. This encompasses all observable characteristics, including physical traits, development, and behavior, which result from the interaction between an organism's genotype and its environment. Phenotypes can vary due to genetic variations and environmental factors, including nutrition, climate, and lifestyle. Understanding phenotypes is essential in fields like genetics and evolutionary biology, as it helps in studying how organisms adapt and evolve in response to environmental pressures over time.