Which terms best complete the chart about characteristics of human development between fertilization and birth? stages of human gestation first trimester second trimester third trimester - embryo develops - organs begin to develop - (1) - starts swallowing - fat begins to develop - (2) - all organs are developed - can hear and see - (3) (1) facial features form (2) heartbeat can be heard (3) nerve cells develop rapidly (1) heartbeat can be heard (2) nerve cells develop rapidly (3) facial features form (1) nerve cells develop rapidly (2) facial features form (3) heartbeat can be heard (1) facial features form (2) nerve cells develop rapidly (3) heartbeat can be heard