The bottom layer of your skin which contains blood vessels, glands, hair roots, and different types of nerve endings is called the
a. dermis
b. epidermis
c. melanin
d. hair follicle

This is a coral reef ecosystem. many biotic and abiotic factors affect the health of this ecosystem. which set correctly pairs a biotic factor and an abiotic factor?

What form of anesthetic was used for field surgery

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.