What cell structure is found only in Eukaryote cells, but not in Prokaryote cells?

For the following, determine the type of reaction and then give products.

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone,due to its high light availability and warm water temperature

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?