10. A fish is characterized by the presence of a) Dermal scales
b) Paired fins
c) Pharyngeal gill slits d) All the above​

d

Explanation:

Fishes are aquatic vertebrates having scales, pharyngeal gill slits and paired fins. ... Most fish are ectothermic ("cold-blooded"), allowing their body temperatures to vary as ambient temperatures change. fishes have scales that covers the skin of fishes. Thus, the correct answer is option D.

D) All of the above

Explanation:

Fishes are aquatic vertebrates having scales, pharyngeal gill slits and paired fins. They lack limbs with digits. Most fish are ectothermic ("cold-blooded"), allowing their body temperatures to vary as ambient temperatures change. fishes have scales that covers the skin of fishes.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

"d.) carbon dioxide and hydrogen sulfide"