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Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.

Stem cells found adult tissue such as in bone marrow brain muscle skin and liver are only capable of what

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?