Refer to the Figure Showing the Marine Worm Bonellia Viridis

question 133

Essay

Refer to the figure showing the marine worm Bonellia viridis. Females of this marine worm release fertilized eggs into the water.The eggs hatch into larvae that swim and then settle on a substrate.If the larvae land on sand, they burrow in and develop into females with large bodies and a proboscis that extends into the water above to collect food.If a larva lands on a female proboscis, it burrows into the female body and becomes a tiny male whose only function is to produce sperm to fertilize the female's eggs.What selection pressures could contribute to this extreme sexual dimorphism?

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