Answer: Fish are farmed by breeding them in controlled environments. Kennels sort of. They are huge cages in man-made resivours with temperature and water control. Once they have grown to be a certain size they are extracted and killed for their meat while the eggs are used to produce another batch of fish. Hope this was helpful :).
Answer:
assist with flood control
Vitamin b12 is the most popular deficiency at the moment- B12 creates red blood cells which travels oxygen around the body- having B12 deficiency can lead to anaemia.
I think the relationship is Commensalism ( relationship between two organisms in which one benefits and the other does not benefit nor is harmed ) because the bird benefits and the cow does not benefit nor is harmed. Hope this helped ☺