This truly depends on what case you are looking at. Personally, I would say yes, things that are BIG or BOLD are usually being expressed importantly or directly. However, in some cases, this is not how it will go.
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An adaptation can also be behavioral, affecting the way an organism responds to its environment. An example of a structural adaptation is the way some plants have adapted to life in dry, hot deserts. Plants called succulents have adapted to this climate by storing water in their short, thick stems and leaves.
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Hope this helps!