Metabolic processes in the primitives.. Nutrition and breathing in bacteria. Self-contained or non-self-contained bacteria. Compulsory bacterium

Metabolic processes in primitives:
A. Nutrition in bacteria: classified into:
1. Self-feeding bacteria: They make their own food by photosynthesis.
2 Non-self-feeding bacteria: They can not make their own food (mostly on the remains of living creatures).
B. Breathing in bacteria: where classified into:
1. Compulsory bacterium: Need oxygen O2.
2 Anaerobic bacteria are mandatory: You do not need oxygen where you get energy from the fermentation process.