Context: The "Lophotrochozoa" hypothesis is also supported by the fact that many phyla within this group, including annelids, molluscs, nemerteans and flatworms, follow a similar pattern in the fertilized egg's development. When their cells divide after the 4-cell stage, descendants of these 4 cells form a spiral pattern. In these phyla the "fates" of the embryo's cells, in other words the roles their descendants will play in the adult animal, are the same and can be predicted from a very early stage. Hence this development pattern is often described as "spiral determinate cleavage".

Question: Which Lophotrochozoa phyla have similar egg development?
Answer: annelids, molluscs, nemerteans and flatworms

Question: How do the cells of Lophotrochozoa eggs arrange themselves?
Answer: after the 4-cell stage, descendants of these 4 cells form a spiral pattern

Question: What is the Lophotrochozoa spiral egg-cell pattern sometimes called?
Answer: spiral determinate cleavage

Question: Which Lophotrochozoa phyla have no egg development?
Answer: Unanswerable

Question: How do the cells of Lophotrochozoa eggs destroy themselves?
Answer: Unanswerable

Question: What is the Lophotrochozoa spiral egg-cell pattern required to be called?
Answer: Unanswerable

Question: What animal contains no cells?
Answer: Unanswerable

Question: What phyla is no longer able to make eggs?
Answer: Unanswerable