Helen is looking at a picture in which some of the border is missing. however, she is still able to understand the object is a picture of an american flag due to the perceptual principle of

Closure

Explanation:

Perceptual principle of closure refers to the unconscious effort that our brain made in order to 'complete' a missing piece that we see with our own perception.

Other example of the use of perceptual principle is when we heard a song lyrics that we know but the song suddenly stopped before finished. Most people will start to 'fill' in the next lyrics of the song in our head even after the music stop.

answer; genetics;

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.