28. Choose the correct statements :
a) Variation in reproduction does not lead to evolution
b) Fragmentation method of asexual reproduction is seen in spirogyra as it has tissue and organ level organisation .
c) DNA copying mechanism cannot be absolutely accurate, and the resultant errors are the source of variation in organisms in a population .
d) Generally motile germ cell is called female gamete and the germ cell which stores food is the male gamete .​