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.
Animals with outer shells and segmented bodies are members of the  phylum arthrapoda. This phylum includes insects and chelicerae's  (spiders, millipedes, etc.).nthropods is the largest and most diverse of all animals. These  animals have segmented bodies that are supported by an exoskeleton.  This group includes spiders, crustacea â¦ ns, millipedes, and  centipedes.