It's September 13th today. It's my birthday. I get up early at 5:30 in the morning. After breakfast, I go to the park with my parents. We take many photos. In the afternoon, my father buys a big birthday cake for me. My friends make many beautiful cards for me. We eat the birthday cake together. I am very happy.

—I'm not sure what to get for her birthday.

—Oh, I've no idea, ________.

观察鸡卵的结构示意图：

（1）写出图中标号所示各部分的名称。
⑤____ ⑥____ ⑦____ 
（2）受精卵中的____ 将发育成雏鸡， ② ____ 鸡胚发育提供____。