Answer briefly. short sentences.
Skeletal system: Hydrostatic Skeleton vs. Exoskeleton vs.Endoskeleton
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Excretory system: Ammonia vs. Uric Acid vs. Urea
Osmoregulation: Hypotonic vs. Isotonic vs. Hypertonic
Thermoregulation: Ectothermic (Poikilothermic) vs. Endothermic(Homeothermic)
Cellular Locomotion: Flagella vs. Cilia
Attack/Defense Mechanisms: Aposematism vs. Camouflage vs.Mimicry