What are the only totipotent cells in humans

totipotent stem cells are the most versatile cells in the human body. one totipotent stem cell is capable of producing a placenta and any type of human body tissue. totipotent stem cells can be extracted from an embryo and allowed to divide in a controlled culture, making them useful in genetic engineering, gene therapy, and transplants.

once the first four days of embryonic development are over, stem cell division produces cells that are considered pluripotent. pluripotent cells are able to develop into any kind of tissue needed by the fetus, but can't develop into the tissue needed for the placenta. from these pluripotent stem cells, multipotent stem cells develop. multipotent stem cells are more specialized, giving rise to a range of cells within a tissue type.

adult stem cells are able to repair or replace dead cells within a specific tissue. they can only operate within a specific tissue range and are considered multipotent stem cells.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.