Saved Bookmarks
| 1. |
Why is the development of extra embryonic membrane is necessary in amniotes? |
|
Answer» In birds and most reptiles, theembryo with itsextraembryonic membranesdevelops WITHIN a SHELLED EGG. The amnion protects theembryo in a sac FILLED withamniotic fluid. The yolk sac contains yolk — the sole source of food until hatching. |
|