Digestive bacteria and humans - Human beings have what is often called "good" bacteria in their digestive systems. This "good" bacteria exists in order to help the human to digest food
Some foods cannot be digested entirely: so, when these foods are consumed, the bacteria
in the digestive system feed on those foods.
The bacteria stay alive.
The human gets help with the process of digestion.
predation
mutualism
competition
commensalism

commensalism

Explanation:

Gut bacteria in particular are very important for digestion in humans and other species. ... In return, the bacteria get a steady supply of food. Commensalism: In commensalism, one organism benefits while the other organism neither benefits nor suffers from the interaction.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

c

explanation: