Answer:
Unlike a steady pattern of growth, arthropods exhibit an external growth that proceeds in a sequence of step-like jumps, as the organism builds and replaces its exoskeleton. The arthropod does not grow bigger in size between these jumps. An aquatic arthropod gradually replaces body mass for water detained inside the tissues between molts.
Oxygen consumptionIs your answer
Cells,tissue,organ organism,organ system
I believe its A because a bonds with t g bonds with c and c bonds with g, translated to rna it's UCG.