Pollen as large as about 90–100 µm. In angiosperms, during flower development the anther is composed of a mass of cells that appear undifferentiated, except for a partially differentiated dermis. As the flower develops, four groups of sporogenous cells form within the anther. The fertile sporogenous cells are surrounded by layers of sterile cells that grow into the wall of the pollen sac. Some of the cells grow into nutritive cells that supply nutrition for the microspores that form by meiotic division from the sporogenous cells. In a process called microsporogenesis, four haploid microspores are produced from each diploid sporogenous cell
The Grains of Sand in early 1966. Around the same time, the Rockin' Bugs agreed to change the group moniker to the Grains of Sand, inspired by a pair of college students studying chemistry while the band members proposed possible alternatives. The Grains of Sand entered Golden Star Studios in Hollywood to record "That's When Your Happiness Began", a catchy pop tune written by the Addrisi Brothers, along with the fuzz-tinged Hodgkins-original "She Needs Me". Session musician Hal Blaine took part in the recording of "That's When Your Happiness Began", which was released, coupled by "She Needs Me" as its B-side, in February 1966.