People are often reminded to conserve water. Explain why we should conserve water if water is never lost but is constantly recycled throughout Earth.

Galaxy whose shape seems different follow no set pattern are classified as

Which properties describe all matter?

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?