Nthe human respiratory system, oxygen enters the body through the nose and mouth, travels down through the lungs, and is transferred into the bloodstream (circulatory system) through tiny gas sacs called a) alveoli b) bronchi c) arteries d) ventricles

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

Chalk is an ionic compound. which is a property of all ionic compounds that makes chalkboard? particularly useful for writing on a a high melting point hardness and brittleness inability to dissolve in water a multicolored appearance

All organisms contribute some water to the water cycle by conducting