SAME DUDE LOL omg what is this
Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little.
The information which is given above is not enough to describe what was the fate of the blastopore, so I am pretty sure that the last option is the best one : It is impossible to tell from the data provided.
Answer:
Each cell has an identical set of chromosomes