| A | B |
|---|
| air cell or air sac | a bubble of air between two membranes in the large end of the egg |
| candling | holding an egg up to a light to see the shadow of the embryo and air cell |
| embryo | th very beginning of an animal while it is part of the mother or egg |
| embryology | the study of the development of embryos |
| fertile | able to produce offspring |
| humidity | the amount of moisture in the air |
| incubation | a process of keeping the eggs warm in order to hatch them |
| infertile | unable to produce offspring |
| nutrients | substances which support life |
| pipping | the breaking of the egg shell by a chick when it is ready to be hatched |
| rotate | to move around |
| ventilation | exchange of air and carbon dioxide |
