The temperate ocean is all of the ocean other than the tropical ocean. They have moderate temperatures, which means they are neither hot nor cold.
Seasons
Giant Kelp
Algae is (are) the most prevalent plant in the ocean. Indeed, the ONLY plant in the ocean. Seaweed, kelp, etc. are all different forms of algae. There are no rooted plants like we see on land, though...
the average temperature in a temperate ocean is 32-56.