| little sac | 0.33 | We breathe air into lungs elaborated with little sacs called alveoli. | ||
| amniotic sac | 0.26 | The bladder on the puny baby was working, refilling the dry amniotic sac. |
| little sac | 0.33 | We breathe air into lungs elaborated with little sacs called alveoli. | ||
| amniotic sac | 0.26 | The bladder on the puny baby was working, refilling the dry amniotic sac. |