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Author
Publisher
Britannica Educational Publishing, in association with Rosen Educational Services
Pub. Date
2015.
Language
English
Description
A cell is the smallest unit of living matter that can exist by itself. Some organisms, such as bacteria, are made up of only one single cell. As for other organisms, such as humans and redwood trees, billions of cells are required. That means that those multitudinous cells have to work together to enable people to do things such as walk, talk, and eat, and for trees to send down roots, sprout branches, and grow leaves. Readers of this authoritative...
Author
Publisher
Britannica Educational Publishing, in association with Rosen Educational Services
Pub. Date
2015.
Language
English
Description
Readers learn that a living organism is a system, or structure, that reproduces, changes with its environment over a period of time, and maintains its individuality by continuous metabolism. To maintain life, an organism repairs or replaces (or both) its structures by a constant supply of the materials of which it is formed. It keeps its life processes in operation by a steady supply of energy. A major contributing part of an organism's survival is...
Author
Publisher
Britannica Educational Publishing in association with Rosen Educational Services
Pub. Date
2015.
Language
English
Description
Bacteria, archaea, algae, fungi, protozoans, animals, and plants consist of one or more cells. DNA controls how the cell reproduces and functions, and determines which traits are inherited from previous generations. In eukaryotes, the DNA is contained within a nucleus. Plants, animals, fungi, and many microorganisms are eukaryotes. Readers discover that in eukaryotic cells, a variety of organelles, including the nucleus, ribosomes, Golgi apparatus,...
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