Why did the grouper, parrotfish, and angelfish populations rise? Why did the sea urchins decline? How did all of this affect the algae population? PLEASE HELP!

Although the two theories differ on the evolutionary path of dinosaurs, they agree that

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

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.