Do fish have bones?
will give brainliest for most explained answer.

yes and no

explanation:

some fish have bones, including full backbones and articulated skeletons, while other fish do not have bones. the bony fish, as they are known, belong to the class osteichthyes. the other class of fish is known as chondrichthyes, which includes cartilaginous fish like sharks and rays.

the bony fish of class osteichthyes are the largest class of vertebrates in the animal kingdom, with more than 20,000 species known to man. bony fish fall into two subcategories: the ray-finned fish and the lobe-finned fish. ray-finned fish make up the vast majority of known living fish species as of july 2014; the coelacanth, once thought to be an extinct prehistoric fish, is the only known living lobe-finned bony fish.

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.