Natural wetlands are lands which, due to geological or ecological factors, have a natural supply of watereither from tidal flows, flooding rivers, connections with groundwater, or because they are perched above aquifers or potholes.
Realize that many verbs can be both transitive and intransitive. An action verb with a direct object is transitive while an action verb with no direct object is intransitive. Some verbs, such as arrive, go, lie, sneeze, sit, and die, are always intransitive; it is impossible for a direct object to follow.
Intransitive verbs are action verbs but unlike transitive verbs, they do not have an object receiving the action. Notice there are no words after the verb sang. More examples of intransitive verbs: I laughed.