Fill in the following blanks with suitable words : (a) The process of ___ ensures continuity of life on earth. (b) Plasmodium reproduces by the process of ___ fission whereas Paramecium reproduces by the process of ___ fission. (c) Rose plants and sugar cane crop are usually grown by the ___ method. (d) Vegetative reproduction of potato plants is done by using ___ (e) Strawberry plants are propagated by the natural ___ method.