Final answer:
Lakes and oceans are the aquatic ecosystems where both littoral and benthic zones are most likely found, with lakes having a more defined littoral zone and oceans encompassing all zones including littoral, benthic, intertidal, neritic, oceanic, and abyssal.
Step-by-step explanation:
The aquatic ecosystems where both littoral and benthic zones are most likely found are lakes and oceans.
The littoral zone is the region near the shore in a lake or the ocean, which can include tidal areas.
In contrast, the benthic zone refers to the bottom of an aquatic ecosystem, which can be present in deep lakes, oceans, or estuaries.
However, rivers typically have more limited zones and do not typically have a clearly defined littoral zone due to the current and flow.
When considering the terms referenced in the question, like intertidal zone (the area of the shoreline which is exposed to the air at low tide and submerged at high tide), and neritic, oceanic, and abyssal (which all pertain to different ocean depths), it's clear that the most complete representation of both littoral and benthic zones is found in both lakes and oceans.