To do a follow up from the freshwater biome, an estuary is where freshwater and saltwater meet, like when a river meets the ocean. Oceans are the largest of the ecosystems, they are large vast bodies of water that take up much of the world and their average temperature is 39 F; the sun only heats the surface of the ocean but way down deep the ocean is cold everywhere. They are split into different levels: intertidal, pelagic, abyssal, and benthic. Here you can see and like seaweed and animals like the dumbo octopus way down deep. 

Another instants where you see the marine biome interact with another biome is in a shoreline, a shoreline is where the ocean meets land. Here you can see plants like anemones and animals like the conger eel, also you may just be lucky enough to catch glimpse of the endangered species the leather back turtle, the thing that threatens the marine life the most is human kind and oil spills, humans affect the ocean by dumping waste into it.  

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