Placenta has an outer layer which is selectively permeable and hormone secreting which is known as

The branch of embryology which concerns with the study of abnormal embryonic development is termed as

In macro and telolecithal eggs site of amphimixis lies in the

Fertilization is fusion of

Which of the following cells secrete testicular hormones called androgens and form endocrine part of the testis?

Amniotic fluid is found in