In summary, a heritable characteristic that an animal or plant to have more offspring which survive to reproduce will tend to become more common in a population as a result of evolution by natural selection. prompt: explain why a characteristic which an animal to live longer will generally tend to become more common in the population as a result of evolution by natural selection.

A characteristic which helps an animal to live longer will generally tend to become more common in the population because as the animal produces more offspring those traits are passed down to them. Eventually it will be a common characteristic in the population.

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"a connection, a bond or common feeling between two people", or as a chemical process it stimulates love or sexual attraction