An eroded area of the stomach mucous membrane is called a peptic ulcer.
According to google. It is a substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction.
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I'm pretty sure these include light availability, oxygen levels, water movement, salinity, density and pH. These conditions often vary from habitat to habitat and will either support or limit the life processes of the marine organisms living there.
Hopefully that's right.
This means that the tissues are most likely from the bone marrow or the epithelium in animals or meristem tissue in plants. These tissues are constantly renewing themselves hence most cells are in mitosis stage. Tissues that are less likely to have such a high number of cells in the mitotic state are bone, connective, and nerve tissues.
