How are all invertebrates alike?

Answer 1

All invertebrates have no backbone and most usually have a had covering much like a wax water proof covering, also all invertebrates can be traced back to have ancestors that were once only aquatic.

Answer 2

Invertebrates are animals that do not have a backbone
All invertebrates lack a backbone, and have no spinal columns. Other than this defining characteristic, invertebrates vary wildly, and have few similarities with each other.

Answer 3

they all have no backbone and they hatch from eggs

Answer 4

They don't have a backbone/spine and so on

Answer 5

because invertabrates have back bones a verterbrate does not

Answer 6

they don't have a back bone

Answer 7

They are all echinoderms.