There are three ecosystem services; which are indicators of the health of an ecosystem and provided for by biodiversity. Which ecosystem service provides nutrient cycling, flood control and seed dispersal?

An isotope is an atom that has a different number of this subatomic particle in its nucleus making it unstable.

Which of the following describes population momentum?

Which of the following is NOT an advantage of oil as a fuel source?

All of the following are evidences of climate change except for

Which of the following is NOT an impact of air pollution?

The process in which excess nutrients in aquatic ecosystems feeds biological productivity, which lowers the oxygen content is known as

Renewable resources are those resources that

Describe Manicheanism.  How did it start, what did it believe, and why did it disappear?

Who was Charlemagne, and why was he important?  Be sure to fully describe his reign, his character, his actions, and the way he structured his kingdom.  As usual, dates matter.