Ionic bonds are when atoms gain or lose electrons, giving it a charge (positive or negative), A covalent bond shares electrons and gets a neutral charge.
Therefore, our answer is D.
Final answer:- <span>D. sharing of electrons between atoms.</span>
Explanation:
Bases on the structure of their mouth and the type of the skeleton, scientists have divided the fish into 3 main categories:
- Jawless Fish
- Cartilaginous Fish
- Bony Fish
<u>Lampreys:</u>
- Lampreys belong to the first category i.e. Jawless Fish.
- Lampryes are mostly parasites and feed on other fish by sucking their blood and tissues using their suction like mouth structures.
- Their body is not covered with scales and they do not have a pair of fins.
<u>Skates:</u>
- Skates belongs to the second category i.e. Cartilaginous Fishes.
- They have jaws and pair of fine unlike Lampreys (Jawless Fish)
- Their bodies are covered with scales.
- These are carnivores.
Gnathostomes are jawed vertebrates, so they have jaws.
