Which of the following organisms is lacking one of the five characteristics typically found in animals?
A) sponges, which have no true tissues but have two layers of cells that perform different functions
B) planaria, who have an incomplete digestive tract but do have muscles and excretory and reproductive systems
C) trypanosome, a single-celled organism that causes sleeping sickness in humans
D) leeches, segmented worms that are predatory on other animals
E) tapeworms, flatworms that infest the intestines of humans

Question

Quizplus · Accepted Answer

Trypanosome is a single-celled organism, which means it lacks the complexity and organization into tissues that are typical of animals. The other options describe multicellular organisms with varying degrees of complexity and organ systems.

Which of the Following Organisms Is Lacking One of the Five