Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. ... Cells have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell. Example are plants and animals. The cells of a multicellular organism may share common features and functions. These cells that act as a unit make up a tissue. The fundamental types of tissues in animals are epithelial tissues (or epithelium), nerve tissue, connective tissue, muscle tissue, and vascular tissue.
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something that is required but is absent or in short supply.
As of 2010, there were an estimated 1.6 billion<span> Muslims around the world, making Islam the world's second-largest religious tradition after Christianity.</span>
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The ancient Greeks contributed far more than three things to European culture, but arguably the three most important are literature, architecture, and medicine
