1. B A reduction in competition.
2. C. Respiratory system
The only logical answer would be C. Unicellular, but the answers seem to be all wrong.
There was no sunlight, in one way or another sunlight is the source of almost all life on the surface of the earth
The correct answer is B. Glycolysis
It is a process that deals with dissolving sugars which leads directly into the Krebs Cycles.
Above 100 specie family found. . for example dolphins
