In the pregnancy time the embryonic cells are developed into different types of cells, tissues, organs How??

The embryonic stage plays an important role in the development of the brain. Approximately four weeks after conception, the neural tube forms. This tube will later develop into the central nervous system including the spinal cord and brain. The neural tube begins to form along with an area known as the neural plate.

Explanation:

it has one origin of replication, but it proceeds in two directions - d)

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .