How big do scientist estimate the universe was just before the big bang occurred?

Use your vocabulary words to complete the sentences below. more of the world's population is now concentrated in heavily populated urban areas known as a this is quite a contrast from the past when or native groups were either farmers or — hunters and gatherers who moved between places in search of food. advanced technology has led to the integration of world economics and cultures, in the world's more developed countries. this integration requires , the responsible use and management of natural resources.

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

Based on the information in the graph, what can you conclude about humans in the world in general?