LifeBacteria evolve to get better at evolving in lab experiment When bacteria were put in alternating environments, some became better at evolving to cope with the changes – evidence that “evolvability” can be gained through natural selection èƵ
LifeMale lemurs grow bigger testicles when there are other males around Dominant male Verreaux’s sifakas always have the largest testicles in their group to make the most sperm, and they can grow their gonads to make sure of it èƵ