They give us informations about our ancestors and how did they live and what did they do and than compare it to present way's of life.
The Grand Canyon is about 5-6 million years old, or was formed about 5-6 million years ago
The correct answer is - urbanization.
The process of urbanization is the one associated with the growth and development of the cities. This process takes place when there's a growing population in a city, both caused by fertility rates and migration towards it, so the local authorities are making the peripheries of the cities and surrounding villages modernized and start to put institutions in them, as well as the necessary modern infrastructure.
The answer is B.
There are 28 days in February. 28 in Spanish is 'veinticinco' and therefore B. is the correct answer.