https://www.nature.com/articles/s41598-021-94342-x https://www.nature.com/articles/s41598-021-94342-x They might have some benefit to the host, but they also c

https://www.nature.com/articles/s41598-021-94342-x https://www.nature.com/articles/s41598-021-94342-x They might have some benefit to the host, but they also cost them energy in drag.