15. Which economic activity most often required workers to settle in an urban setting? a. Farming
b. Manufacturing
c. Mining
d. Fishing tant trade

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons

Ineed , i need to create a power point in life science here is a picture explaining a little what the topic is about, me with some information for my slides : (