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.

a symbiotic relationship with the mitochondria