One of india's largest and most impotant rivers for human use is the River. However, the river has been modified and now suffers from severe . Please select the best answer from the choices provided.

Which of the following is a feature of all cells? o a. all cells have a nucleus. o b. all cells have dna for at least part of their life cycle. het . o c. all cells are spheres. o d. all cells have a rigid cell wall.