While teaching his son to learn cycling, mark initially held his bike to him to maintain his balance. once his son was able to balance himself, mark gradually let go of the support. this temporary support that mark provides to his son is known as

Scaffolding

Explanation:

Scaffolding refers to an effort to create temporary helps to sustain a learning process that is conducted by an individual. The purpose of scaffolding is essentially to accelerate the learning rate and optimize basic understanding of a certain concept.

Even though scaffolding tend to greatly accelerate the learning process in the beginning of the curve, it would become less and less effective as the learning materials become more complicated.

because he had a big bear belly