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If you get bored eating the same thing over and over, spare a thought for dogs. Many pet dogs eat the same thing every day, week after week. And a change in food can be abrupt – empty the old bag of dog food, and start with something brand new. But how long does it take a dog to adjust to a new diet?

Coral reefs, rainforests, wetlands – these are just a few examples of ecosystems. But you don’t have to go travelling far and wide to find them. You have your own personal ecosystem that goes wherever you go: your microbiome.