Final answer:
Inherited factors, or genes, are essential in determining an individual's appearance.
Step-by-step explanation:
Inherited factors, also known as genes, play a crucial role in determining an individual's appearance. These genes are passed down from parents to their offspring and contain the instructions for the development of physical traits such as eye color, height, and facial features.
Although environmental factors can also influence appearance, genes are indispensable because they provide the blueprint for how these traits will manifest.