(tr) to address or present a petition to (a person in authority, government, etc): to petition Parliament. 6. (foll by: for) to seek by petition: to petition for a change in the law.
An invertebrate is an animal without a backbone. (An animal with a backbone is called a vertebrate.) Invertebrates live in every part of the world. In fact, most of the animals on Earth are invertebrates.Invertebrates come in all different shapes and sizes.Some can be seen only through a microscope.ponges, flatworms, jellyfish, sea. Encyclopaedia EncyclopÃ¦dia, Britannica. Inc an invertebrate is an animal without a. (Backbone an animal with a backbone is called a.) Vertebrate invertebrates live in every part of the. world
Platyhelminthes and Nematoda are two major invertebrate phyla in the Kingdom Animalia that show some difference between them in terms of their morphology. Invertebrates are the animals who lack backbone. The other major invertebrate phyla include Porifera, Cnidaria, Annelida, Arthropoda, Mollusca, and Echinodermata.