How it was formed, like most rocks a e formed from volcanoes and some from sand
Substances<span> move in and </span>out of cells<span> by diffusion down a concentration gradient, through a partially permeable membrane. The efficiency of </span>movement of substances in and out<span> of a </span>cell<span> is determined by its volume to surface area ratio. ... Osmosis is a type of diffusion but refers only to the </span>movement<span> of water molecules.</span>
<span>The concept of cell signaling is a communication network that is responsible for majority of the cellular activities. It is important that if the cell is deprived of this ability it will soon die. Since a cell is able to correctly interact with it's environment and perceive it, they are able to repair tissues, develop, and become immune to normal tissue homeostasis.
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Mitosis is cell division in to daughter cells with the same chromosome number as the parent cell
