Describe two roles that enzymes play in dna replication. .

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Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

Which of these is a provisioning service people get from the ocean

Does solar energy ever run out? brainliest