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Scientists believe that mitochondria and chloroplasts may have evolved from ancient bacteria because ____.

Which element is most likely to share electrons with other atoms in joint orbitals?​

A researcher in a lab finds a microscopic organism that is a producer and found in extreme environments (e.g., hot springs). The researcher will correctly identify this organism as belonging to the domain

Plant cells grow primarily by increasing ____.

Are saturated or unsaturated fats generally solids at room temperature? Explain why there is a difference in the fluidity of these two related molecules.

Which of the following is a positively charged ion? 

List the three principles of the cell theory.

In DNA and RNA, there are four nitrogen bases that complement each other through base pairing. Which nitrogen base bonds with a different base in each nucleic acid.

Observe the structures of glucose and fructose below. These two molecules differ in the  G & F.JPG 

A trace element is one found in specific organisms in _____ quantities and is _____ for normal biological functions.