Final answer:
Some traits in an investigation are primarily affected by genetics, environment, or a combination of both.
Step-by-step explanation:
The traits in an investigation can be affected primarily by genetics, environment, or a combination of both.
Genetics: Traits determined by genes are primarily influenced by an individual's genetic makeup. Examples include eye color, height, and certain personality traits.
Environment: Some traits are primarily influenced by environmental factors such as nutrition, exposure to sunlight, and social interactions. Examples include language acquisition and certain learned behaviors.
Combination: Many traits are influenced by both genetics and the environment. For example, intelligence is influenced by both genetic factors and educational opportunities.