In Galapagos Charles Darwin Discovered a large amount of birds and reptiles that had developed a sense of isolation from the main land.
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Explanation:
1st question is humans eat other organisms to get nutrients they need to survive.
2nd one is Eukaryota domain
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The mechanism is natural selection.
Explanation:
Natural selection is the mechanism that these air-breathing fishes have gone through to survive. This mechanism allows species to survive and reproduce due to differences in the phenotypes of every individual in the specie, throughout the time the heritable traits that every individual inherits changes according to the environment and the characteristics of its ancestors.
Water is the body's most indispensable nutrient. Indispensable means the most essential, in this case, it's water.