Respuesta :

makenziewilliams
They were completely heterotrophic in nature because it allowed them to absorb different materials from the environment as an energy source.
The correct answer to this question is this one: they lacked oxygen. The earliest organisms were completely heterotrophic in nature because of the reason that they lacked oxygen. A heterotroph is an organism that cannot fix carbon and uses organic carbon for growth. 

Otras preguntas