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Providing immunity by injecting the body with a weakened form a pathogen is known as

Astudent is looking through a microscope at some cells of an onion root tip. many of these cells are undergoing division since the root tip grows quickly and requires more cells. which cell most recently underwent metaphase? w x y z

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca