a coral polyp is an animal with no back bone
The past tense of "be taken aback" is "was taken aback" or "were taken aback," depending on the subject.
The coral snake, as a vertebrate, has bones.
No it doesn't have a backbone.
Yes, as far as I know a rag worm is an Invertebrate.
Medically the coral is sterilized and used to reconstruct places where bone is needed. For example if a person has a bad motorcycle accident and their cheek bone is destroyed, sterilized coral would be shaped and placed into the skull to replace the missing bone.
pharmacutical breakthroughs provide protein from fish as food tourism
"He was taken 'aback' by the story he heard"
aback is having the wind against the forward side of the sails.
Coral reefs: 1. Increase aquatic biodiversity 2. Act as a habitat for aquatic organisms 3. Are used in bone replacements
Coral skeletons are composed of calcium carbonate, which is easily broken down in the stomach, and absorbed, and then used by the body to build bones.
Coral reefs are aquatic plants with a very thick and ever growing 'bone' like structure. All sorts of creatures live in Coral, it would be nearly impossible to list them all in one sitting.