Zooplankton, the microscopic plant-eaters that form the base of the marine food chain, dropped 70% because warmer waters suppressed colder, nutrient-rich currents.
(the microscopic plant-eaters; form; the base of the marine food chain) (Zooplankton; dropped; 70%; because warmer waters suppressed colder, nutrient-rich currents) (warmer waters; suppressed colder; nutrient-rich currents) (Zooplankton; [is]; the microscopic plant)
the microscopic plant-eaters Zooplankton warmer waters Zooplankton
form dropped suppressed colder [is]
the base of the marine food chain
70% because warmer waters suppressed colder, nutrient-rich currents
nutrient-rich currents
the microscopic plant