The amount of Earth's water that is usable as a freshwater resources can vary. There is a very large percentage of freshwater available, but much of it is unobtainable.
By their selfisheness and their lack of ability to think about other organisms apon the earth.
Decomposers break down dead organisms which produce carbon dioxide and nutrients. These nutrients are then used by other organisms such as plants.
Some people believe the earth was first created 4.6 billion years ago, humans did not exist, nor did any other life forms. Humans didn't come into being until 15 million years ago, about 4.45 billion year's into earth's history.
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Earth has a core of solid and liquid iron, a mantle of ultramafic rock, a crust of complex mineral compounds, and an atmosphere of nitrogen, oxygen, and other gases. Physical and chemical reactions on the Earth include the compound water (dihydrogen oxide or oxidane) in all three of its physical phases. Carbon-cycle (living) organisms utilize and alter the surface of the planet.
Ecologists study how living organisms and the earth interact with each other.
Approximately 0.3% of all freshwater on Earth is readily accessible for direct human use and for use by land organisms. This water is found in rivers, lakes, and groundwater sources that are not too deep or polluted for practical use.
If you are wondering what a paleontologist studies, well its not the Earth or organisms (which other people on this website put) they study fossils such as dinosaurs.
Insects are different from other organisms because they don't have any Lungs . Most organisms on earth have lungs other organisms do not , that is why they are different.
Nothing. There are no organisms on Earth that depend on humans for food. There might be some species that would die out naturally without human intervention.
A salt water has an advantage over other organisms because the earth is made of more salt water then it is fresh water or land. This gives it more space to live and reproduce.
Bacteria, Protazoans, and other microscopic organisms.
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Gravity.
Assuming you mean "How much of the water on Earth is fresh water", about 5% of the water on the Earth is fresh water, as opposed to about 95% salt water. To anser your question directly though, 100% of the fresh water we know about is on Earth. There is some water on other celestial bodies, but I wouldn't exactly call it fresh water.
The first living organisms on earth were a type of aquatic photosynthetic bacteria called cyanobacteria (blue-green algae). These organisms formed structures called stromatolites. These organisms did not become extinct and still exist in both salt and fresh water environments.
Fresh clean water is needed by animals including people for health. If the water available is not fresh or clean it may carry organisms or txins that will be harmful. Some countries have a shortage of fresh water for various reasons. The population of the country may be too large to be supported by the natural water resource, the water may be wasted or polluted by bad practices.