Tertiary egg membranes are lacking in mammals with the exception of the
Euetherians
Metatherians
Prototherians
None of the above
The rate of cleavage is inversely proportional to the duration of
There is a connective tissue cord extending between the testis and abdominal wall called
Which one of the following statement is correct
In man the foetal membrane which forms the intimate connection with the uterine tissue is
The eggs of elephant are