Identify the following statements as applying to the embryonic development of vertebrates as mammalian, non-mammalian or both (do not take egg-laying mammals into consideration when responding):

Yolk (Mammal/Non-Mammal/Both)

Gastrulation (Mammal/Non-Mammal/Both)

Blastocyst (Mammal/Non-Mammal/Both)

Placenta (Mammal/Non-Mammal/Both)

Zygote (Mammal/Non-Mammal/Both)

Mammals do not have yolk but instead yolk sac which is for nutrition. Non mammals like birds, reptiles have yolk for nutrition during embryonic development.

Gastrulation is the process that occur in mammals and reptiles where the single layer blastula is rearranged Into a multilayer gastrula.

Blastocyst occur in mammals embryonic development. It is the thin walled structure that contain cluster of cells from which the embryo develop.

Placenta is found in mammals. It is the structure that develop during pregnancy in mammals which provide nutrients and oxygen to the embryo.

Zygote refers to the cell that is formed from fertilization of sperm and egg. It occur in both.