Embryologists can presume the future organs of the embryo in
Blastula
Early gastrula
Morula
Post gastrula
$A$ : Fertilin protein is present in the egg membrane.
$R$ : It helps in agglutination reaction
As a result of cleavages, if blastomeres are symmetrically placed around the polar axis the type of cleavage is known as
Cleavage in bird's egg is
The fertilization membrane during fertilization is synthesized by
In the embryonic development of chordate the animal pole forms one of the following of the adult