Which characteristic is shared by both cnidarians and flatworms?

a) dorsoventrally flattened bodies
b) flame cells
c) radial symmetry
d) a digestive system with a single opening
e) both a and d

The answer is D: a digestive system with a single opening.

Cnidarians and flatworms have a digestive system with a single opening.

Explanation: Cnidarians are species of aquatic animals. They are mostly marine organisms that live in both marine and freshwater where they get food. Their respiration and digestion takes place through one orifice and a body cavity.

Flatworms are simple soft-bodied invertebrate animals. Their bodies are not divided into segments.  Flatworms depend on a large surface in order to allow oxygen and nutrition to diffuse into their bodies. They have a digestive system with a single opening. Their habitation are  in marine, freshwater, and damp terrestrial environments.

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).