Bio Lab Essay

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Galapagos Finches Introduction The Galapagos Islands are located just off the west coast of South America. They are made up of many islands and have helped with the scientific explanation of evolution. The recordings are done on the very small, 1/8 square mile, island called Daphne Major. Due to the small populations of living organisms it is very easy for scientist to keep a close eye on the fluctuation. No human life is accounted for on the island unless you are one of the scientists going to research the finches. The island is very rocky with no trees and has a tendency to attract heat making it a dry climate. It has two seasons, the wet season, January through May, and the dry season, June through December. The majority of the rain that the island gets comes during this wet season (2). On the Galapagos there are fourteen different types of finches (2). There are small ground, medium ground, large ground, and cactus finch all on the Daphne Major Island. Characteristics of the different finches range from size of legs, beak size, weight, and wing size. Most of the finches feed off the ground but a few eat small insects, fruit and seeds, however the cactus finch mostly feeds on the cactus plant. Reproduction accurse in the medium ground finches after the first heavy rain falls during the wet season (2). Other birds that live on the island are hawks and owls. The island has four main plants, cactus, chamaesyce, portulaca, and tribulus that help feed the finches and other animal populations (2). The cactus plant produces a green fruit and nectar for the finches to eat. The chamaesyce plant grows better in the higher arid parts of the islands. While the chamaesyce likes arid areas the portulaca grows on rocky places. It also has leaves that change color through the different seasons. The tribulus is a vine plant and yields the most seeds in the wet

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