Why does the primary productivity in the gulf of Mexico fluctuate over the year?

What does the Tokyo statue of liberty look like? Which Michigan doctor helped more than 1500 fugitive slaves? How many slaves were buried in great pyramid of Giza? What America city is niagara falls closest to? Why are there no plants at the deepest part of the ocean? When was Creat Studios created? How many jobs are related to tourism in this country? How many planes have disappeared in the Bermuda Triangle? The matterhorn mountain is on the border of which two countries? How do you build a thirty six inch paper tower? What is the river that is considered what is the river that is considered mostly holy by Hindus called? What continent includes the Caspian Sea? How come route 66 so popular? What was sir Norman fosters first building? What is the importance of atoll? What is the zip code for grosse pointe shores Michigan? Why is the river brown? What type of rock is coral? How is the engraving at the top of the Washington Monument translated? How would you describe the indus river?