Simple subject - <u>Mercury</u>
Simple predicate - lacks
Direct object - An atmosphere
Mercury lacks what? An atmosphere
<h3>How are direct objects different from indirect ones?</h3>
A noun or a noun phrase that the subject of a sentence performs an action on is referred to as a direct object. The "what" or "whom" of the sentence—the object of the transitive verb—is referred to as a direct object (also known as the action verb). In a sentence, it is the object of the activity. However, some phrases, like as those that use linking verbs, may not require a direct object.
A word, pronoun, or noun phrase that denotes what or who gets the direct object is called an indirect object. When a sentence also contains a direct object, the indirect object acts as the receiver of the direct object.
To learn more about direct and indirect objects from given link
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