How are sea urchin sperm able to locate eggs even though both types of gametes are released into a potentially large surrounding body of water, such as the open ocean?

Question

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a
Using chemotactic agents released by sperm to bind to eggs

b
By the ability of mature sea urchins to sense and approach others prior to gamete release

c
By sensing appropriate currents

d
Using sperm-activating peptides

Answer 1

a
Using chemotactic agents released by sperm to bind to eggs