The electrons needed by photosystem ii originate from water.
The following three things can wipe out a water bear (AKA: tardigrade)
1.<span>A nearby star goes supernova and sends deadly radiation pummeling toward Earth
2.A gamma ray burst from an unknown origin fries Earth
<span>
3.Asteroid impact</span></span>
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Embryonic and early fetal development occurs in the first trimester.
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