Oxygen is composed of only one kind of atom and can’t be separated into simpler substances. what type of matter is it? solution element mixture compound colloid

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum

Anurse used a 0.02-mg/l solution of disinfection to clean a patients wound. what is the concentration of the solution expressed as a percentage?

Why do lunar and solar eclipse not happen every month