In this article. If you own a dog, you've heard this rule: 1 year for Fido equals 7 years for you. Turns out, the math isn't that simple. Dogs mature more quickly than we do early on. So the first year of your fuzzy friendâs life is equal to about 15 human years.
The phylum Arthropoda is the largest animal phylum. It contains all the insects, crabs, lobsters, spiders, and scorpions. It is believed there are more than one million types of insects alone on the planet, with many of them yet undiscovered. General characteristics of arthropods include jointed legs and an exoskeleton.n ancestral chordate is shown in the image below. There are a couple of organisms in this phylum that are invertebrates. One such creature is called the sea squirt. Sea squirts show the four characteristics of all chordates previously described, but they never develop a solid backbone.
The phyla of kingdom animalia are determined by evolutionary traits of an animal, and are grouped below the kingdom level. The largest phyla in kingdom animalia are phylums: Mollusca, Porifera, Cindaria, Platyhelminthes, Nematoda, Annelida, Arthropoda, Echinodermata, and Chordata, our own phylum.