Ageologist is studying rock layers in an old river bed, and he finds a fossil of a fish and a horsetail rush in the same rock layer. according to the law of faunal and floral succession, the geologist can assume that the rock containing the fossils may date back as far as the

The development of_ factored in the development of complex organisms.

What did the first language sound like

Now it's your turn to investigate human impact around the world. grab your virtual lab coat and put on your environmental science hat. you will be taking a trip around the globe to explore three locations. at each location, you will investigate the cause and effect relationships of deforestation, desertification, and urbanization. you will also gather evidence of how these factors have impacted the environment over time