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Cell (biology) - Wikipedia, the free encyclopedia
Cells emerged at least 4.0–4.3 billion years ago. The current belief is that these cells were heterotrophs. An important characteristic of cells is the cell membrane ...
en.wikipedia.org/wiki/Cell_(biology)
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Home of CELLS alive!
A visual tour of cells, bacteria, viruses and their interaction with one another.
cellsalive.com
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What is a Cell - National Center for Biotechnology Information
WHAT IS A CELL? Cells are the structural and functional units of all living organisms. Some organisms, such as bacteria, are unicellular ...
www.ncbi.nlm.nih.gov/About/primer/genetics_cell.html
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Biology4Kids.com: Cell Structure
Cells are the Starting Point All living organisms on Earth are divided in pieces called cells. There are smaller pieces to cells that include proteins and organelles.
www.biology4kids.com/files/cell_main.html
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The Cell - Courses Pages
The cell is one of the most basic units of life. There are millions of different types of cells. There are cells that are organisms onto themselves, such as ...
web.jjay.cuny.edu/~acarpi/NSC/13-cells.htm
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