Easy. Answer is oxygen because it says which one was missing before any life was on earth. And in order to have life on earth you need oxygen!
:)
Answer - Will try to Answer in simplest form with Reasoning. Since no one responded.
1.Solar-Thermal energy. For example the sun radiates thermal energy aka heat which then turns Liquid aka Water in gas molecules because they are escaping. (Evaporation)
2. Condensation happens when the water molecule vapor clump together before thermal energy can be separated by it. Such as the clouds which they form tiny vapor/mist. Thats why when your on a plane and when you hit thru that cloud at hundreds of mph. Your hitting water molecules lol.
Answer:
Carbon Dioxide
Explanation:
google plus proof below I guess
<em><u>please mark brainliest</u></em>
According to the phylogenetic tree, Eukarya evolve <u>First in the Prokaryotic Organisms.</u>
