Question

Higher organisms have resorted to sexual reproduction in spite of their complexity. Why?

Answer 1

Sexual reproduction is complex (long and energy consuming) process characterized by meiosis and fertilization which in turn add new genetic combination (i.e. new characters) to the existing species. Genetic diversity serves as raw material for natural selection which favors the characters that impart survival advantage to individuals. Accumulation of these adaptive characters over generation makes the population better adapted to prevailing condition and imparts survival advantage.