In an eight-cell embryo of an organism, the cells of the upper tier are aligned over the cells of the lower tier at a slight angle. which organism is it likely to be?

For an organism having an eight-cell embryo, the cells of the upper tier were aligned over the cells of the lower tier at a very slight angle. Given these conditions, it can be concluded that the organism is likely to be a sea cucumber. The growth of the sea cucumbers starts with the development of the larvae.