ABOUT NATURAL SELECTION

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.

We all have different forms of genes from our parent(s).what are these different forms called? a. alleles b. characters c. dna d. resources

Achange in which factor will affect the rate of reaction only when gases are involved? temperature pressure surface area concentration