A stem is thing that hold up the flower. stem can also mean like diverge stems are dis and verge that is what another meaning of stem is.
The let side of a stem a stem and leaf plot
They have a woody stem with thorns. Hope this helps.
Most likely because they are the cells from which all specialised cells Stem, i.e. stem cells are the precursors which form more differentiated types of cells, e.g. blood, bone are formed from, or...
hold the flower and travels the water through from the leaves and flower