How long can a person hold their breath before they pass out

Well, it all depends on the endurance of your lungs. That would mean that your lungs can either hold in breath for 10 seconds and you would pass out or your lungs could hold your breath for 2 minutes and you would be perfectly fine. Not only that, you can't just pass out from holding your breath. You're brain will force you to start back breathing. In order to pass out, you would have to be doing some extreme physical training.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.