Explanation:
Given the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near-modern levels in the ocean could have spurred the Cambrian explosion. ... This supported the idea of oxygen as a key trigger for the evolutionary explosion.
Relative dating is used to identify what things existed before or after another. This is usually seen in fossils in which layers of new fossils are laid on top of each other.
Absolute dating uses scientific techniques to identify the actual date of when a fossil or animal existed
Filling in the gaps of absolute dating with that of relative dating, these methods made the geologic time scale.
Answer: B. the 20th Amendment, setting January 20 as inauguration day for the president
Explanation: The 20th Amendment, also called the Lame Duck Amendment, decreased the amount of time between the presidential election and the inaugration of the new president. This was made because of advances in technology with faster travel and communication.
Answer:
An Urban settlement is a concentrated settlement that is part of an urban area. It is an area with high density of human-created structures.
Explanation:
An urban settlement is where displaced populations settle within an urban agglomeration such as a town or city. A master plan usually divides towns or cities into zones regulated by norms based on specific sectors such as housing, hygiene, habitat, and environment.
The Congo river. it provides much needed water to a large portion of the population and provides a large amount of transportation of goods.
