Is Phytoplankton abiotic or biotic?

What are the two important industries in the United states

What is the name of the destructive force that breaks down rock?

What biome covers the eastern part of the united states?

The average annual rainfall in Dubuque lowa is 36 inches. If the rainfall contains 0.5 ppm of nitrogen, how much nitrogen is added to the soil in Dubuque in an average year?

Which of the following statements is true? A. The sun will eventually die, but it will not affect Earth. B. The sun uses its own matter to create light and heat. C. The sun is a rare G2 star, which means it is extremely bright. D.

In archaeology, there must be a balance between the explanation of the value and workings of archaeology, revealing the mysteries of past and present cultures, and to promote respect for archaeological sites. True or false?

The blocking off of an estuary from the sea forms a (n)

Why are there few or no clouds in the stratosphere

Why did Columbus use prisoners as part of the crew

Wich american started a settlement in texas in the early 1820s?