Since the adoption of the Bill of Rights â the first 10 amendments to the Constitution, ratified in 1791 â only 17 amendments have cleared the hurdles necessary to be codified in the nation's founding document, the last of which was ratified in 1992.
Other examples are leeches and sand worms. Believe it or not, 75% of the entire animal kingdom is right here in phylum Arthropoda! Arthropods include all insects, spiders and crustaceans so it is a HUGE phylum. Arthropods are known for having protective exoskeletons and segmented legs. Some have 6 legs, 8 legs or even 10 legs but none of them have a backbone.
A phylum is the taxonomical rank below kingdom and above class. The kingdom Animalia contains approximately 40 phyla. Organisms are grouped into phyla based on a general body â¦ plan. For example, the phylum Chordata contains all those animals with a spinal cord.