Christian communities developed a formal church structure within its clergy. At first the clergy included priests and bishops, the highest ranking church officials. As the church expanded, archbishops were appointed to oversee the bishops.
Answer:
Paleontology is the study of the history of life on Earth as based on fossils. Fossils are the remains of plants, animals, fungi, bacteria, and single-celled living things that have been replaced by rock material or impressions of organisms preserved in rock.
Explanation: Hope this helps :)
B because when one started helping the they all started helping
Heres a quickie,
The Philipines
Mexico
And India