Observe the leaves.
Meaning: This means to look at the leaves closely and carefully. It's like saying, Pay attention to the details of the leaves.
Choice of Words: Observe is a verb that means to watch or look at something carefully. The is a definite article used to specify a particular group of items, in this case, the leaves. When you put them together, "Observe the leaves" is a request asking someone to look at the leaves carefully.
Alternative Expressions
Related Expressions