Question

Which encloses fluid filled cavity to support the embryo itz chorion aminion allantois or all of these??

Answer 1

amnion encloses the fluid known as amniotic fluid  , filled in the cavity to support embryo.
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Answer 2

The amniotic sac, commonly called the bag of waters, sometimes the membranes,] is the sac in which the fetus develops in amniotes. It is a thin but tough transparent pair of membranes that hold a developing embryo(and later fetus) until shortly before birth. The inner of these fetal membranes, the amnion, encloses the amniotic cavity, containing the amniotic fluid and the fetus. The outer membrane, the chorion, contains the amnion and is part of the placenta. On the outer side, the amniotic sac is connected to the yolk sac, the allantois and, via the umbilical cord, to the placenta