i. The male and female gametes are formed and released simultaneously. Due to which the chances of fusion of the gametes increases.
ii. Many gametes are produced at once which increases the chances of fusion of the gametes. Even if some gametes are lost or are immotile.
iii. Water is the medium in most organisms exhibiting external fertilization as shown by fish, coral and sea anemone etc.
iv. Offspring formed as a result of external fertilization have lesser chances of survival than those formed inside an organism. They are born in open environment and are exposed to many predators all the time.
Hence, only statements i and iii holds true.
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