A cooler area appearing from time to time on the sun's surface, appearing dark by contrast with its surroundings.

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

If your blood becomes too concentrated with iona, what will happen to the red blood cells

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic