Answer:
commensalism
Explanation:
Commensalism is a type of ecological interaction between two species in which one speices benefits while other is unaffected. Commensalism also can be considered as a type of symbiosis-two species that live together. The interaction between human and its microbiota is beneficial for microbiota while it has no effects on humans.
Although, some bacteria (gut bacteria) can help in digestion. In this case, interaction with human is mutualism (both have benefits).
Answer:
Omega-3 Fatty Acids
Essential fatty acids cannot be produced in the body in needed amounts, so they must be consumed through the diet. They are classified as omega-3 and omega-6 fatty acids.
Explanation:
hope it helps:)
Hormones is the term you are looking for, but I may be wrong
The term migration fits the definition of a species brought into an ecosystem where it doesn't naturally occur