Alrighty, so, I believe the answer you're looking for is C.) Plate tectonics. All of the continents used to be combined at one point, when they separated, everything changed because certain areas of land were then at different parts of the planet. Fossils have been discovered of certain dinosaurs that could never have lived in the climates in which they were found which furthers the plate tectonics theory.
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I believe the answer is plasma membrane.
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p53 gene is an important gene that regulates the proper functioning of the cell. This gene plays an important role in the cell cycle progression and acts as genome guardian.
Any mutation in p53 leads to the formation of the different types of cancer cells. The p53 gene is activated by teh phosphorylation at the particular sites. High levels of phosphorylated p53 in the cell indicates that the cells DNA is highly damaged and mutated.
B. Excretory system. Think of it helping things to EXIT your body
The Miller-Urey experiment is important because this was considered as the breakthrough in the study of origin of life, as to where and how exactly life began on earth and that it was possible to form organic molecules from inorganic molecules.