I think its Oxygen.
ancient cyanobacteria produced Earth's first oxygen-rich atmosphere, which allowed the eventual rise of eukaryotes. T<span>he chloroplasts of eukaryotic algae and plants are derived from cyanobacteria</span>
Answer:

Explanation:
In series combination, the equivalent resistance is given by :

Let the identical resistors be R. We have, 
So,

So, the resistance of each resistor is
.
The force on a 64 k person decelerating on that rate would be :
F = ma
F = 64 kg x 30 x 9.8
= 18816 N
Hope this helps
Jupiter ............................................
The answer is basis of texture