第一段的从句有三个:
It happens ...when gardeners ake cuttings...
when引导时间状语从句.
It also happens ...when twins identical...when引导时间状语从句.
The fact is that these are...that引导表语从句
定语从句在图下面的8句和9句.
8、The embryo is put into...sheep C,who...
引导词是who,先行词是sheep C.
9.The lamb is the clone of ...sheep B,which provided...
引导词是which,先行词是sheep B.