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Desert Biomes A desert is a place that has few or sometimes even no life forms Sometimes life forms adapt to living in deserts but conditions tend to be extreme and survival is challenging Some deserts can be visited but not lived in Some deserts are so inhospitable that life as we know it cannot survive in them at all In terms of rainfall areas that receive less than ten inches of rain a year are considered to be deserts Some deserts receive only three or four inches of rain a year A few places do not receive any rain at all When we think about deserts we think about limiting factors These factors include Liquid Water on earth liquid water is necessary for life Some life forms survive periods when water is not available by becoming spores or seeds or by becoming dormant hibernation or estivation Some plants can survive for many years as seeds Insects and unicellular life forms can also wait out drought Sooner or later however liquid water is necessary Survival is essential but it is not all of life Without growth and reproduction life is on hold not progressing Salinity can also interfere with an organisms use of water Fresh water fish cannot live in the ocean and land plants watered with sea water will die The excess salt in briny water pulls water out of the organism and dehydrates it If you put a salt water fish in fresh water it will die too because the organism will retain too much water in its cells Energy Sunlight is the ultimate source of most of the energy used by living things on earth Plants use sunlight for photosynthesis Lack of light in caves and under deep water make these environments unsuitable for photosynthesizing plants Hydrogen Sulfide a small set of life forms live around deep sea volcanic vents using a process called chemosynthesis to extract energy from the
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