Which of the following statements is true? * O Hormones are usually needed in large amounts. Hormones are usually needed in small amounts. Hormones are carried by the respiratory system. Hormones are produced by the nervous system.​

Hormones are usually needed in large amounts - False

Hormones are usually needed in small amounts. - True

Hormones are carried by the respiratory system. - True

Hormones are produced by the nervous system.​ - True

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explanation:

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.