In addition to the ectoderm and the endoderm, triploblastic flatworms possess a third tissue layer sandwiched between the two, called the .

Discuss in detail the 3 human diseases that are transmitted by lice (worth 30) 

For most host species, they have both a chewing and a sucking louse species. 

Which are known as the “butterflies of Love” 

Which caused Napoleons’ defeat in the Russian campaign 

Molluscs are generally dioecious, meaning male and female sex organs are found in  individual(s).

Which are known as cooties 

If roaches are peridomestic that means 

Chewing lice mainly effect 

Roaches are