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Chemical bounds

Nov 23, 2016• Category: Biology

Some Types of Chemical Bonds close to 99% of the weight of a living cell is composed of just four elements: carbon (C), hydrogen (H), nitrogen (N), and oxygen...

cell membrane

The Cell and Its Components

Nov 23, 2016• Category: Biology

Cells are the smallest organized structural units able to maintain an individual, albeit limited, life span while carrying out a wide variety of functions....

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