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Which of the following is the pH for an acid?

Which of the following is the correct way to write a scientific name?

In biogeochemical cycles the word fixation refers to changing matter/atoms 

When describing the parts of a biogeochemical cycle the term “sink” refers to  

What is the name of the positively charge particle found in the nucleus or center of an atom?

There are different types of thinking that can be compared to critical thinking or can be used within critical thinking.  One of those types is  creative thinking, which

The type of system in which energy and matter can enter and exit is called a(n) _____ system.

What are the four most common elements found in living organisms?

 A niche can be defined as 

Explain what a keystone species is by giving a definition and an example.