At the start of what 2 seasons do all areas of the earth get 12 hours of a day and 12 hours of night

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?

Using the periodic table, determine which material is most likely a good conductor

What sre the effects of hemolytic disease of a newborn