The atmosphere and seas of the early earth lacked oxygen. what kind of organisms could not have lived under those conditions?

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602