The sea, lentic, lotic, and benthic are all types of aquatic ecosystems:

 The sea, lentic, lotic, and benthic are all types of aquatic ecosystems:

Lentic: A still or nearly still body of water, such as a lake or pond. The word "lentic" comes from the Latin word lentus, which means sluggish.

Lotic: A body of water that is freely flowing, such as a stream or ocean.

Benthic: The bottom of a body of water, such as the seafloor or lake bottom. 

Here are some other characteristics of these ecosystems:

Lentic ecosystems

These ecosystems can range in size from small, temporary pools to Lake Baikal, which is 1,642 meters deep. The bottom of lentic ecosystems is called the benthic zone, where dead organisms fall and are eaten by bottom-dwelling animals. 

Lotic ecosystems

These ecosystems have higher oxygen levels and clearer water due to the constant movement of the water. The flow of water in a stream or river varies by location, which affects the types of plants and animals that can live there. 

Freshwater ecosystems

Both lentic and lotic ecosystems are freshwater ecosystems with a low percentage of dissolved salts.