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Animal cells have cell walls; whereas plant cells do not. 

What did the University of Georgia microbiologists estimate as the total number of bacterial species on Earth?

Photosynthetic pytoplankton are important in the carbon cycle because they:

What is the phenetic approach to building phylogenetic trees based on?  

Which statement best describes protists?

Bacteria and Archaea are:

Which hypothesis about the origin of mitochondria is most widely supported?

Which molecule stores genetic information in all cells?

Which of the following best describes ecology?

Why do coastal areas generally have more moderate temperatures than inland areas?