गर्भावस्था के किस सप्ताह तक प्लेसेंटा (अपरा) पूरी तरह से निर्मित और कार्यात्मक हो जाता है?

The embryo begins to differentiate itself into three distinct layers known as:

The protective fluid that surrounds and cushions the developing embryo inside the gestational sac is called:

A nurse educating postgraduate nursing students explains early embryonic development. Which finding best confirms that an embryo has progressed beyond the morula stage but has not yet implanted?