Periosteum is the thin yet tough outermost layer of bones. Its many collagen fibers support the bone and firmly connect it to the surrounding structures. Osteogenic cells in the periosteum play a vital role in the growth and repair of bony tissue.
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Organic Process: a natural process occurring in living organisms
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Phytoplanktons are photosythetic organisms found near ocean surface and provide food to a wide variety of sea creatures like whale, shrimp, jelly fish etc. They also rely on nutrients such ad nitrates, phosphate for their development. They maintain a balance ecosystem and food web in ocean.
I would believe a. prophase
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read below !
Explanation:
it's basically the layers from the earth's crust, all the way out to space. there are 5 layers in all, and they all protect earth from the things in space, and the suns rays. it keep gravity in, and things like that !!
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