Answer:
four blood types, a, b, ab , and o,
Commensalism :)
in case when bacteria and human, both are benifited.
The discovery of hydrothermal vents changed all that. Vast communities of animals grew big and fast in the depths! Instead of using light to create organic material to live and grow (photosynthesis), microorganisms at the bottom of the food chain at vents used chemicals such as hydrogen sulfide (chemosynthesis).
A volatile acid can leave the solution and enter the atmosphere
