Characters in humans such as a person's red and white blood cell counts vary quite a bit depending on such factors as altitude and physical activity.Traits like this are referred to as

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Traits that are affected by multiple factors, such as environmental conditions and genetic variation, are called multifactorial traits. Examples include height, weight, and susceptibility to diseases. Red and white blood cell counts can be influenced by both genetics and environmental factors, making them multifactorial traits.

Characters in Humans Such as a Person's Red and White