Animal body systems are similar in many ways mollusks, amphibians, arthropods, echinoderms, reptiles, annelids, and humans all have some similar things. They have a skeletal system of some type, Muscular systems, Respiratory systems, Excretory systems, nervous systems, circulatory systems, and digestive systems. Some animals have and endocrine system but for the most part only humans have an endocrine system.
Mollusk- octopus
Amphibian- frog
Arthropods- crab
Echinoderms- starfish
Reptiles- Green sea turtle
annelids- Earth worm
Mollusk- octopus
Amphibian- frog
Arthropods- crab
Echinoderms- starfish
Reptiles- Green sea turtle
annelids- Earth worm