Does a plant stem always have just one apical meristem at any given time? If I think I see multiple buds at a single shoot tip (multiple "apical buds"?), what am I looking at? Is it: multiple ("codominant") apical meristems, or the buds compete for dominance until one of them ends up being the apical meristem, or one of the buds is the apical meristem & the others are axillary buds pressed up really close to it? Thanks!