(2008? Tangshan) By observing the structure of fertilized eggs (see figure), the following questions are analyzed and answered: (1) You can put the blunt end of eggs up and cut them with scissors.

Egg cells in eggs refer to yolk, yolk membrane and blastoderm, in which yolk provides rich nutrition for embryo development; Yolk membrane refers to the cell membrane, which has protective effect; There is a nucleus in the blastoderm, which is where the embryo develops. It will develop into an embryo and an air chamber, which stores the oxygen needed for embryo development.

(1) You can turn the blunt end of the egg upward, gently break the eggshell at this end with scissors, and peel off the eggshell. In this way, seven air chambers can be observed, in which oxygen needed for embryo development is stored.

(2) There are nuclei in the blastoderm, which is the place where embryos develop and will develop into embryos in the future. Therefore, the real living structure in an egg is the blastoderm.

(3) The material and energy needed for the development of eggs and embryos mainly come from yolk, and egg white also provides nutrients and water.

(4) After the egg is laid, the embryo development stops, and after the female chicken hatches, the embryo can continue to develop and eventually develop into a chick. This phenomenon shows that the fertilized eggs of oviparous animals mainly develop outside the mother's body and are greatly influenced by external temperature.

So the answer is:

(1) air chamber;

(2) blastoderm;

(3) egg yolk;

(4) temperature.