Identify the Gerund in the following sentence: Getting up early in the morning is sometimes a challenge.

The word that can be classified as a gerund in this sentence is "getting".
In grammar, a gerund is a type of word that derives from a verb but rather than acting as a verb it acts as a noun. Here is an example:
The word kayaking looks like a verb but it refers to a concept or it acts as a noun.
The gerund in this sentence is "getting" because as most gerunds this derives from a verb but is a noun rather than a verb.
Learn more about gerund in: https://brainly.com/question/11017355