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Answer to quiz about the least optimal condition for fertilisation success in Cucumaria miniata:

aggregated distribution 
synchronous spawning 
low tide slack 
males downstream from females
slow current flow

NOTE the highlighted factor is the one that the reader should have selected, based on what was presented in the previous Research Studies, but it is a bit of "red herring". When you think about it, being upstream or downstream for either sex is about the same, especially given the varying directionality of tidal currents and wave action. Also, in many or most species, the presence of gametes in the water from either sex may be the stimulus required for spawning in a downstream individual, whether it be the same, or opposite, sex. This is not known. 

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