First water, air(oxygen), temperature, after sporting needs Sunlight and
Cyanobacteria were very simple organisms and performed were an role in changing Earth's early atmosphere. They carried out photosynthesis to produce the materials they needed to grow. In this process, they release Oxygen which is needed to sustain life on Earth for Humans and other organisms.
Answer of Q.1. is:
C] Ferns
While, Answer of Q.2 is ;
B] Mollusks
