Question

bacteria and tapeworms are very different in their body design ?

Answer 1

Bacteria are microbes while tapeworms are longest parasite that may live in our body

Answer 2

due to change in course of evolution.   

Bacteria and Tapeworm differ in their classification mainly due to the following reasons:-

Bacteria is prokaryotic whereas Tapeworm is Eukaryotic. 

bacteria-unicellular whereas tapeworm-multicellular.