Grasshoppers have a(n) exoskeleton hydroskeleton endoskeleton, tapeworms have a(n) exoskeleton endoskeleton hydroskeleton, and crocodiles have a(n) endoskeleton exoskeleton hydroskeleton.

- Grasshoppers have an exoskeleton
- Tapeworms have an exoskeleton
- Crocodiles have an endoskeleton

Exoskeleton are the skeletons that are found outside that supports the animal. Usually, it is found at their back for protection like in grasshoppers. Endoskeleton are found inside which is common among the vertebrates including the crocodile.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.