The earth, the sun, and the rest of the solar system are almost unimaginably old when viewed on a human time scale. while modern humans first evolved approximately 200,000 years ago, the age of the earth, the sun, and the rest of the solar system is approximately years. a)4.6 billion b)4.6 million c)200,000 d) 100,000

Write a 150-word essay describing the effect of people's activities on the environment in the region.

Are divergent boundaries responsible for tsunamis?

Which ecosystem best fits the characteristics listed below? which ecosystem best fits the characteristics listed below? ii. seasonal migrations of millions of wildebeests, zebras, and elephants iii. large numbers of predators, such as lions iv. acacia trees and grasses a. the congo rainforest b. the african mangroves c. the serengeti grasslands d. the sahel