When performing the Kastle-Meyer test, a blood spatter analyst will perform a positive and negative control before testing the samples at the scene. If, during an experiment, both the positive and negative controls produce the same results, what should be done and why?

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Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system