Answer:
C - Contains the embryonic disk
Explanation:
After an egg is fertilized, it begins to divide into smaller cells, from the 1 cell stage, to 2, to 4 and so on. Then, on the third day, the cells fall within 16-200 cells and it is then called a <em>morula</em>.
On the fifth day, the morula becomes a ball of calls which is now differentiated into an <em>inner cell mass and a trophectoderm</em>. The inner cell mass becomes the <em>embryo</em> as development goes on and the trophectoderm, becomes the <em>placenta</em>.
As development goes on further, the floor of the amniotic cavity is formed by the embryonic disk, a layer of prismatic cells derived from the inner cell mass.
The embryonic disc develops into 3 layers:
There is a major differentiation of cells which gives a template for the origin of development of specific organs of the embryo.
Answer:
No, bones grow first to develop a frame for the muscle to grow on.
PXL
The answer is T-cells.
T-cells (T-lymphocytes) have a central place in cell-mediated immunity. On the surface of T-cells, T-cell receptor is present. When T-cell binds to the antigen via antigen receptor, the recognition occurs. Therefore, T cells act as a bridge between the cellular and humoral (antigen) response.
Answer:
All of the above
Explanation:
Plants do photosynthesis, which creates food. They need nutrients such as nitrogen from the soil. They undergo transpiration to move water throughout the plant until its released
B. Gravitropism is the correct answer
