Final answer:
Nematoda has evolutionary advancements over Platyhelminthes, including having a complete digestive tract and a pseudocoelom body cavity.
Step-by-step explanation:
The evolutionary advancements of Nematoda (phylum Nematoda) over Platyhelminthes (phylum Platyhelminthes or flatworms) are significant and highlight the evolutionary complexities within invertebrates. Among the options given:
- Nematoda has a complete digestive tract. This is true. Nematoda exhibits a complete digestive system, unlike flatworms, which have an incomplete or absent digestive system.
- Nematodas are triploblastic. This is not an advancement over Platyhelminthes, as both nematodes and flatworms are triploblastic, meaning they have three primary germ layers.
- Nematoda are deuterostomes. This is incorrect. Nematoda are not deuterostomes; they are protostomes, as are the flatworms.
- Nematoda had a pseudocoelom. Nematodes have a body cavity called a pseudocoelom, which is an advancement over the acoelomate flatworms.
Therefore, the correct answers are that Nematoda has a complete digestive tract and a pseudocoelom body cavity which are advancements over Platyhelminthes.