What is captive breeding and how does it help protect biodiversity? What is a drawback to captive breeding?

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.