Yes. Both are phyla.
No, roundworms are not diploblastic; they are triploblastic. They possess three germ layers: ectoderm, mesoderm, and endoderm. This classification places them in the group of animals known as triploblastic organisms, which also includes most other animals, including vertebrates and many invertebrates. Diploblastic organisms, like cnidarians, have only two germ layers: ectoderm and endoderm.
Porifera(sponges) and Nematoda(roundworms).
Roundworms and tapeworms, among many others.
small cnidarians and big cnidarians
jellyfish and mosquitoes are two creatures that have nematocust a stinging cell used by animals hunting and stunning their prey
Vertebrates and invertebrates.
He divided animals into two groups- those with red blood and those without it.
Elephants and bees are two animals that have a female as the leader.
No, cnidarians are not protostomes. They are classified as diploblastic animals, meaning they have two germ layers during development (endoderm and ectoderm), whereas protostomes are triploblastic animals with three germ layers. Cnidarians are more closely related to animals like jellyfish, corals, and sea anemones.
hookworm
Aristotle subdivided his two groups of animals based on their blood. He classified animals as either having blood (vertebrates) or not having blood (invertebrates).
Vertebrates and Invertebrates