Oxygen, I hope! I thought maybe carbon? That is all that is needed, but 20 characters are required, so!
Or did you want, carbon, although an element not a compound, is needed to release energy for metabolism.
" <span>RespirationWhat is respiration?Respiration is the chemical process by which organic compounds release energy. The compounds change into different ones by exergonic reaction"</span>
Ok,
So what don't you understand. The whole page
The temperature : 263.016 K
<h3>Further explanation</h3>
Combined with Boyle's law and Gay Lussac's law
![\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7BP_1.V_1%7D%7BT_1%7D%3D%5Cdfrac%7BP_2.V_2%7D%7BT_2%7D)
P1 = initial gas pressure (N/m² or Pa)
V1 = initial gas volume (m³)
P2 = gas end pressure
V2 = the final volume of gas
T1 = initial gas temperature (K)
T2 = gas end temperature
P1=760 mmHg
V1= 4 L
T1 = 275 K
P2=704 mmHg
V1=4.13 L
![\tt \dfrac{760\times 4}{275}=\dfrac{704\times 4.13}{T_2}\\\\T_2=263.016~K](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B760%5Ctimes%204%7D%7B275%7D%3D%5Cdfrac%7B704%5Ctimes%204.13%7D%7BT_2%7D%5C%5C%5C%5CT_2%3D263.016~K)