What is the characteristic of the gastrula stage of embryo development? select one of the options below as your a. formation of the neural tube and nervous system b. formation of the three germinal layers and the primitive gut c. formation of the amniotic cavity and archenteron

The best answer is option B. Formation of the three germinal layers and the primitive gut.

Explanation:

During early embryonic development, single-layered blastula reorganized or fold inwards to form a multilayered structure, known as gastrula. This process is known as gastrulation.

During gastrulation, three germ layers- ectoderm,  mesoderm, and endoderm and internal part known as primitive gut or archenteron are formed in triploblastic animals.

Later on, ectoderm gives rise to the nervous system, epidermis, and neural crest; mesoderm gives rise to bone, muscle, and connective tissue; and the endoderm gives rise mainly to the digestive system and respiratory system.

trachea, alveoli, lung capillaries, arteries