Permanence relates to the manner in which a trait varies over time.

Other physical traits can vary greatly, depending on the species, individual and stage of development.

But other traits, such as alienation, morale and feelings of satisfaction, can vary greatly as a person goes through life.

These certain traits will vary with certain species as well as if the animal is shown for market or for breeding stock.

Incremental theorists believe that traits are more dynamic and can vary over time.

Some traits may vary a little in other countries, but the basic type is the same.

The servus callidus or clever slave is always talkative, but his other traits vary.

Supernatural traits still vary for each character type, but their interactions with each other are governed largely by a single, simple mechanic.

The traits vary from person to person and can produce different actions or behaviour from each person.

In practice, all traits vary and almost all traits show some heritability.