The lower an organism is in the food chain the greater its population.
No, worms are not arthropods. Arthropods are invertebrates with an exoskeleton, segmented body, and jointed appendages, such as insects, spiders, and crustaceans. Worms, on the other hand, are soft-bodied invertebrates belonging to phyla such as Annelida or Nematoda.
Arthropods
All phyla contain invertebrates. The only one that contains vertebrates is the phylum Chordata, but it also contains some invertebrates.
The chordata contains both vertebrates and invertebrates.
The arthropods fall into a categorization (taxon) called a phylum (in taxonomic nomenclature there is an entity called a 'class' which is below the phyla). Arthropods have segmented bodies, an exoskeleton made from chitin, and joint appendages.
Cows
Phylum: Arthropods Class: Crustaceans
They're not, really. The animal kingdom is divided into multiple phyla, such as arthropods, molluscs and roundworms. Vertebrates are only one of these phyla. They're classified according to their traits and evolutionary history, and grouped according to their relation to one another.
All phyla except for one (Chordata) include only invertebrates, so 8 phyla include only invertebrates. The phylum Chordata is made up of the subphylum Vertebrata so therefore Chordata also has some species in it that are invertebrates. Humans are included in the phylum Chordata as well as the subphylum Vertebrata.
There are more than 5.
The phylum arthropoda is one of the phyla into which we divide invertebrates. It contains the insects, spiders and crustaceans amongst other things. They are animals with outer skeletons and jointed legs.
There are more than two phyla in the animal kingdom... There are many phyla in the animal kingdom. There are a few phyla of worms and other invertebrates and then you have the vertebrate ohyla. Unless that's what your asking? Did you want the invertebrate and vertebrate in general phyla? That's the only set of 2 things I can think of.