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The answer to your question is:
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<u>Double-helix</u> is the structure of dna as first published by james watson and francis crick in 1953.
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Turning nitrate back into nitrogen gas, the process of denitrification, happens through the work of denitrifying bacteria. These bacteria often live in swamps and lakes. They take in the nitrate and release it back to the atmosphere as nitrogen gas
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A cladogram is a diagram used to represent a hypothetical relationship between groups of animals called a phylogeny. a cladogram is used by scientists studying phylogenetic systematics to visualize the groups of organisms being compared, how they related, and the most common ancestors.
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Hope this helped Mark BRAINLEST!!!!