Please please help me Can find the complementary strand for this

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?

In the african savanna,more wildebeests are born than the environment can support. which is most likely to happen over a period of years as a result

The body of water found at number 4 on the map above is the