Red the following statements : 

(i) Organisms exhibiting external fertilization show great synchrony between the sexes and release a large number of gametes 

(ii) A major disadvantage of external fertilization is that the offspring are extremely vulnerable to predators 

(iii) In gymnosperms male gametes reach egg with the help of water as a medium 

(iv) Zygote is a vital link that ensures continuity of species between organisms of one generation and the next. 

(v) Every sexually reproducing organisms begin their life as a single-celled zygote 

Which of the above statements are correct ?