In many species of fish, the number of eggs that a female can produce is constant throughout her life, whereas large males dominate small males in competition for females (so small males have very little chance of mating). Under the size-advantage model, you might then expect
a. individuals to be female throughout life.
b. individuals to always be male regardless of age.
c. individuals to switch from female to ma.
d. individuals to switch from male to female with age.