What makes up different phyla?

Phyla are the highest level of classification in the biological taxonomy system. They are made up of groups of related organisms that share common characteristics. These characteristics can include physical features, such as body structure, or genetic traits, such as DNA sequences.

Here are some examples of the different phyla and their characteristics:

* Porifera (sponges): Porifera are multicellular animals that have a porous body and lack tissue organization. They are filter feeders and use their pores to draw in water and filter out food particles.

* Cnidaria (jellyfish, corals, sea anemones): Cnidaria are multicellular animals that have a body made of two layers of cells, with a jelly-like substance in between. They have stinging cells called nematocysts that they use to capture prey.

* Platyhelminthes (flatworms): Platyhelminthes are multicellular animals that have a flat, worm-like body. They have a simple digestive system and lack a circulatory system.

* Nematoda (roundworms): Nematoda are multicellular animals that have a long, round body. They have a complete digestive system and a pseudocoelom, which is a body cavity that is not lined with mesoderm.

* Annelida (segmented worms): Annelida are multicellular animals that have a body that is divided into segments. They have a complete digestive system and a closed circulatory system.

* Mollusca (clams, snails, octopuses): Mollusca are multicellular animals that have a soft body, often protected by a shell. They have a complete digestive system and an open circulatory system.

* Arthropoda (insects, spiders, crustaceans): Arthropoda are multicellular animals that have a segmented body, jointed appendages, and an external skeleton. They have a complete digestive system and an open circulatory system.

* Echinoderm (starfish, sea urchins): Echinoderm are multicellular animals that have a body that is radially symmetrical, with a water vascular system and tube feet. They have a complete digestive system and an open circulatory system.

* Chordata (fish, amphibians, reptiles, birds, mammals): Chordata are multicellular animals that have a notochord, a dorsal nerve cord, pharyngeal slits, and a post-anal tail at some point in their life cycle. They have a complete digestive system and a closed circulatory system.

These are just a few examples of the different phyla and their characteristics. There are over 30 phyla of animals in total, and each phylum is made up of a diverse group of organisms that share common characteristics.