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A comparison between chromosomes found in a normal human cell and a cancer cell from the same person
Photograph of a person with a cataract in the right eye.
Infants often rely on a caregiver as a secure base when they meet a new person.
A well-folded letter fits easily into the envelope and is easily removed by the person who receives ...
(left) Urine sample from an unaffected person does not change color upon exposure to air. (right) Ur
A farmer has 100 acres of land on which she plans to grow wheat and corn. Each acre of wheat ...