A grackle and a sparrow try to eat from the same ear of corn in a field. This is an example of mutualism?

Asolution containing hci would likely have

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.

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the