the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that

mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they

mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they

the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they

brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that