Cells

The cell is the basic unit of all known organisms. A cell is the smallest unit of life. Cells are often called the "building blocks of life". The study of cells is called cell biology, cellular biology, or cytology.

Cells consist of cytoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids. Organisms can be classified as unicellular (consisting of a single cell; including bacteria) or multicellular (including plants and animals). 

The number of cells in plants and animals varies from species to species, it has been estimated that humans contain somewhere around 40 trillion (4×1013) cells. Most plant and animal cells are visible only under a microscope, with dimensions between 1 and 100 micrometres.

Cells were discovered by Robert Hooke in 1665, who named them for their resemblance to cells inhabited by Christian monks in a monastery.

Cells emerged on Earth at least 3.5 billion years ago.

Watch this video. It is in my opinion a very complete video that talks about how cells are made and how they work.

An important process in life is photosynthesis. Watch this fantastic video.

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