"Of the million or more animal species in the world, more than 98% are
invertebrates. Invertebrates don't have an internal skeleton made of bone.
Many invertebrates have a fluid-filled, hydrostatic skeleton, like the
jelly fish or worm. Others have a hard outer shell, like insects and crustaceans.
There are many types of invertebrates. The most common invertebrates include
the protozoa, annelids, echinoderms, mollusks and arthropods. Arthropods include insects, crustaceans and arachnids."
INVERTEBRATES -
ONE OF TWO MAJOR ANIMAL GROUPINGS
According to Biology4kids
"There are two basic groups of higher animals. They are vertebrates and invertebrates. While both have advanced through the processes of evolution, there is one fundamental difference. Invertebrates
do not have backbones. Both groups are in the Kingdom Animalia, but
their bodies are organized differently. What makes invertebrates
different? All invertebrates share common traits. At the bottom of the
invertebrate world are the sponges. Sometimes they don't fit in but they are still part of the group. Here's the nice and neat little list."
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