Answer:
oxygen gas
Explanation:
because oxygen is needed for life on Earth
Explanation:
heat (metal or glass) and allow it to cool slowly, in order to remove internal stresses and toughen it.
OR
recombine (DNA) in the double-stranded form following separation by heat.
The Palestine Liberation Organization (PLO; Arabic: منظمة التحرير الفلسطينية, Munaẓẓamat at-Taḥrīr al-Filasṭīniyyah) is a Palestinian nationalist political and militant organization founded in 1964 with the initial purpose of establishing Arab unity and statehood over the territory of former Mandatory Palestine, in opposition to the State of Israel.