Why do different organisms have different types of heart

Organisms live in different environments, which has harsher climates and affect how they live. Organisms have different circulatory systems, and cannot share the same heart due to how large a animal may be or how much blood needs to be pumped inside of the animal. Hope this helps :)

Well bc they both are different living things and every living thing has to have a heart to pump blood
And etc but it depends on the size of the animal/insect

The answer is c : ) hope this answered your question!