Articles > Growth and Development of a Human Baby – Quiz Growth and Development of a Human Baby – Quiz Quiz Arrange the events from 1 (start) to 5 (last). Two distinct cell types form: embryoblasts and trophoblasts. Arm and leg buds begin to grow as well as the eyes and ears. The embryo starts to develop major systems and structures, such as blood cells and nerve cells. The embryo grows into a fetus. The zygote divides by mitosis. Send Your Results (Optional) Your Name To Email Time is Up!