Question

what does it mean if a trait is dominant?
if the trait is present, then the trait is always expressed.
if the trait is present, then the trait is never expressed.
if the trait is absent, then the organism will not survive.
if the trait is absent, then the organism will survive.

Explanation:

In genetics, a dominant trait is one that is always expressed when present in an organism's genotype.

Answer:

If the trait is present, then the trait is always expressed.