The simplest kind of invertebrates would be sea sponges. They are part of the phylum Porifera and are the only animals that do not have a nervous system at all.
turantula
The arthropod group
marine invertebrates
it has the coldest soil
They live in the savannah.
none at all
In most cases invertebrates do not have any circulatory system. However, the few that have one have the closed circulatory system.
invertebrates
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.
Vultures are everywhere! Keep moving...!
some birds that live in the savannah are ostrich, savannah sparrow, emu, that's all that I know