The one trait that is expressed when two competing traits are present is called

dominant trait

Explanation:

Dominant trait -

During the process of reproduction , certain traits gets carried away and certain are left behind , in the new offspring.

The characters which gets carried further from the parents to the offspring is referred to as the dominant trait.

Where as , the traits that are less likely to get carried forward are referred to as recessive traits.

Hence, from the question,

The correct term for the given statement of the question is dominant traits.

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.