Complete the Concept Map to describe embryonic development including the formation of the primary germ layers and the extraembryonic membranes. Drag the appropriate labels to their respective targets
1. allantois and yolk sac
2. hypoblast cells
3. piblast cells
4. blastocyst
5. mesodernm
6. chorion
7. amnion
8. ectodermm
9. endoderm
A. include(s) the outer B. form(s) a bilayered C. form(s) a bilayered
trophoblast, which help embryonic disc, one layer embryonic disc, one
form extraembryonic of which is made of(s): layer of which is made of:
membrane(s) called the:

The development of the embryo is starts with the blastocyst which made two layers. These layers give rice to a complete new born.

Embryology:

It is the branch of science that deals with the development of embryo and classify the stages of development.

Therefore, the development of the embryo is starts with the blastocyst which made two layers. These layers give rice to a complete new born.

To know more about embryology,

link

The correct answer is given below and attached as an image as well.

Explanation:

Blastocyst forms during the stage early embryonic developmental of mammals. The outer cell layer of the blastocyst is known as trophoblast. This outer cell layer gives rise to extra-embryonic membrane - chorion.

The epiblast leads to the development of ectoderm, mesoderm, endoderm known as the three germ layers. It also forms an extra-embryonic layer called the ambion.  Yolk sac and allantois are formed with the help of hypoblast.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

read more on -