All three species of zebra have bold stripes in comparison to other African grazers like buffalo and antelope.
The life cycle of ferns is different from other land plants as both the gametophyte and the sporophyte phases are free living. This interactive illustrates the alternation of generations in ferns.ametophyte (prothallus). The prothallus is the fern gametophyte. It is a green, photosynthetic structure that is one cell thick, usually heart or kidney shaped, 3â10 mm long and 2â8 mm broad. It is very difficult to find in the bush as it is so tiny.
During the course of evolution, the sporophyte stage has become progressively increased. Thus, in the higher (i.e., vascular) plants the sporophyte is the dominant phase in the life cycle, whereas in the more primitive nonvascular plants the gametophyte remains dominant. The dominant phase in algae often depends on environmental conditions, though some species have determinant life cycles and are commonly gametophyte-dominant.