What is the main purpose of a speech bubble in a graphic novel?

Speech bubbles in comics or graphic novels are essential tools that are used to convey dialogue that is being uttered aloud. They are one of the most important elements because they reveal what an author is going to depict in a story and how characters vary from one another.  

The bubble is also depicted in different shapes indicating someone may be yelling (pointy), thinking (cloud-shaped), whispering (dotted lines), or speaking in a manner different than the other characters (different font, bubble shape).

It illustrates internal thoughts.

Explanation:

answer: having more negative in their interactions with their child more or likely because of issues with stress and depression.

explanation:

teenage parents may also have less time as they juggle their responsibilities to spend with their child which can make the child feel lonesome and not enough trust was made to create a foundation between the parent and the child.