B or d.... hope this helps:)
Answer:
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.
Hello, to answer your question properly it is
C. <span>The waves emitted by the two sources have constant phase difference
Signed by, Virtuoso Sargedog
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A, an object in motion stays in motion unless acted upon by an outside force.