Trials.
Methods, control, and variables aren’t the experiments themselves.
Answer:
D.
Explanation:
Plants take in CO2 and turn into Carbo.
That's the most efficient example
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.
