Question

Arrange the steps in the order they in occur during the development of neurons.

1. Signaling factors cause precursor
neurons to produce neurons.

2. Stem cells arise from the inner mass
of cells.

3. Genes that lead to the production of
undifferentiated precursor neurons
are activated.

4. Signaling factors trigger differentiation
in stem cells.

Answer 1

The sequence is as follows:

4 to 2 to 1 to 3.

Answer 2

The answer is

4 , 2 , 3 , 1