They measure the seawater temperature, salinity, oxygen content, pH, and the amount of chlorophyll associated with phytoplankton (microscopic marine plant cells that produce organic material via photosynthesis).
(They; measure; the seawater temperature, salinity, oxygen content, pH, and the amount of chlorophyll) (chlorophyll; associated; with phytoplankton) (microscopic marine plant cells; produce; organic material)
They chlorophyll microscopic marine plant cells
measure associated produce
the seawater temperature, salinity, oxygen content, pH, and the amount of chlorophyll
with phytoplankton
organic material