I would imagine it improves diversity and overall health depending on exposure type, considering it is known that exposure to different environments early in life increases diversity and promotes immune systems in children. That's why some countries keep children outside. Kinda only makes sense. However, I doubt it would be as concrete as the title. People are always doing something in their environment. What they are doing alters a lot, like the butterfly effect.

I would imagine your biome is shaped by your family because your family affects your early exposures to life and even later in your life. Sharing the same food, areas, people, etc. Good chance you and your friends have the same environmental exposures and share similar things as family, and, obviously, your neighbors would have part of the same environmental exposure as you on the daily. Same with the people living in your house. You and your SO would share a similar biome because yall typically do a lot together and share a lot on the daily. Honestly, the title comes off as sensational when it really seems like this could just be chalked up to sharing the same environment and environmental factors like food, drugs, activities, people, etc.