Why is photosynthesis a very important evolutionary and geological step in the history of life?

Can someone give me a concrete definition of "physical barrier effects"?

How many political entities are in mainland South America

What cash crop do farmers of the Sahel raise?

Which of the following would not encourage a population to experience exponential growth?

List combustion factors affecting VOC emissions. Explain your answers.

What is the population of Texas

In "Rider in the City," what type of character is Margie? A static character because she changes B dynamic character because she changes C static character because she stays the same D dynamic character because she stays the same

The principle of uniformitarianism states that geologic processes that happened in the past cannot predict or explain why current geologic processes happen. True False

Dams are often built to generate power. One negative impact of damming a river is reduced flow downstream water storage to battle a drought increased recreation opportunities flood control

What three cities form the global centers of economic activity?