sponges are one invertebrate group which has no mouth, stomachs or other organs
Jellyfish.
Invertebrates that are found in the Savannah are Beetles, Ants, Worms, Spiders, and Moths.
The arthropod group
marine invertebrates
Echinoderms have tube feet, with the exception of urchins, which have spines. They are invertebrates. They also have no organs or eyes.
The simplest kind of invertebrates are typically single-celled organisms like amoebas or multicellular organisms like sponges, which have very basic body structures and lack complex organ systems. These invertebrates often have limited mobility and basic feeding strategies.
Yes Yes it does All insects and arachnids are invertebrates and have exoskeletons.
In most cases invertebrates do not have any circulatory system. However, the few that have one have the closed circulatory system.
I think the word you're after is just invertebrates. Vertebrates and those animals with a notachord are known as the Chordata - but those with neither spinal chord nor notachord are simply invertebrates.
The organs of excretion in flatworms are contractile vacuoles. Flatworms are invertebrates that do not have any specialized excretion organs.
Heart
The kidney in vertebrates, and the nephridia in invertebrates, are specialized organs for excreting metabolic wastes. These organs filter waste products from the blood and help maintain the body's internal environment by regulating water and electrolyte balance.