The Old field succession is a man-made secondary succession that occurs when a farmer stops cultivating their field for a lengthy period of time.
The definition of old fields, which has been a topic of discussion among modern ecologists for some time, is that they are an intermediate stage in the natural succession of an ecosystem moving towards its climax community. Many times, old field sites are marginal lands with poor soil quality that are unfit for pasture or farming.
The terms "grass and forbs stage," "shrub and sapling stage," "pole stage," and "mature forest" are frequently used by foresters to describe these stages. Forest succession is the process by which plant communities develop in a regular, predictable manner.
When a farmer gives up on a farm, the abandoned land quickly becomes overgrown with weeds and grass.
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Answer:
"The immune system is made up of special organs, cells and chemicals that fight infection (microbes). The main parts of the immune system are: white blood cells, antibodies, the complement system, the lymphatic system, the spleen, the thymus, and the bone marrow."
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Answer:
Vitamins and minerals are considered essential nutrients—because acting in concert, they perform hundreds of roles in the body. They help shore up bones, heal wounds, and bolster your immune system. They also convert food into energy, and repair cellular damage.
