Problem 1: Many species of animals in the sea have larval forms. These include diverse organisms such as fish, mussels, barnacles, and crabs. Speculate what some of the evolutionary advantages might be to a species that spends part of its life in a larval stage. What could be some of the risks?
Problem 2: What are some of the possible explanations for the adaptive significance of diurnal vertical migration? Propose at least one hypothesis that could explain these movements and how you might test it.