Assertion : The earliest organisms that appeared on the Earth were non-green and presumably anaerobes. Reason : The first autotrophic organisms were the chemoautotrophs that never released oxygen.

Step-by-step solution

The first living organisms originated among organic molecules and in oxygen free atmosphere. They presumably obtained energy by fermentation of some of these organic molecules. They were non-green and anaerobes (capable of respiring in absence of oxygen). They depended on the existing organic molecules for their nutrition, hence they were heterotrophs. Then came autotrophs when the supply of existing organic molecules were exhausted. These organisms were capable of producing their own organic molecules by chemosynt