<span>The oldest eukaryotic fossils are from </span>diverse algae and soft-bodied invertebrate animals from some 2.1 billion years ago.
Selective pressure could be any phenomena that would most probably alter behavior and fitness of living organisms in an environment. It is the driving force of evolution and natural selection. Thus, selective pressures influence or leads to the evolution of organisms. Some of the organisms will not survive, reproduce thus, some members of the generation will not be able to pass their genes to the next generation.
There are a whole of three natural sources of water. They are categorized as rain water, underground water and surface water. Here is a look at each and what provides these sources. Rain water contains other references such as snow and additional types of precipitation.
Water is one of the natural resources, which are found in an adequate amount. It is an important source for the existence of life on the planet earth. It is widely used for various purposes such as drinking, washing, bathing, cleaning, cooking, irrigation, and other industrial and domestic uses.
<h3> Which is the enormous water resource on Earth?</h3>
Oceans, which are the biggest source of surface water, comprise approximately 97 percent of the Earth's surface water.
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