Just about every rocky shoreline in the Galapagos Islands is home to the marine iguana.
These lizards are found throughout the islands, and have population concentrations of up to 4,500 individuals per mile. Their total population on these islands have been estimated to be between 200,000 and 300,000.
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Venous anastomosis (or some people call it circulatory anastimosis) ia a connection between two blood vessles, such as between arteries and veins.
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(Its not a big answer but i really hope this is the answer you are looking for)
The correct answer is - They supply the energy needed for living processes.
Both the carbon and the nitrogen, are gases that are crucial for the survival of the organisms on the planet. They are mostly used by the producers in the ecosystems, as they need them to manage to perform their cycles, get nutrition, and of course energy. The producers are the basis of the ecosystems, so if they do not have a healthy supply of carbon and nitrogen, the ecosystems on the whole planet will collapse. The carbon and the nitrogen later go from one organism to another as the energy is transferred, and usually end up back into the atmosphere again.