Which of these cannot be decomposed into simpler substances?

What is the solubility of substance?

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

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy