What is the best summary of the excerpt? pangu grew inside an egg, then hatched into a giant creature, releasing shells that formed the sky and the earth. after pangu died, he became the world and its elements. pangu was a giant creature that came from an egg, lived a long time, and then died. the giant pangu formed inside an egg and grew safely inside for eons. he grew ten feet a day for 18,000 years. upon pangu’s death, the world and its elements were formed.

The best summary of the excerpt is "Pangu grew inside an egg, then hatched into a giant creature, releasing shells that formed the sky and the earth. After Pangu died, he became the world and its elements."

Explanation:

The purpose of summarizing a written work is to make a shorter version that includes all the important information without too elaborated syntaxis to be easy to read to everybody, in this option the full story is simplified without omitting important information or adding unnecessary details which make it a correct summary.

sentence lenght varies according to word choice.you select which word to use and that will require to use other expressions that collocate with the word chosen.sentence length will vary   according to the choice of words you make to express your ideas.