This is an expository prose.
The explicit statement in paragraph 4 that leaves no implicit suggestions is;
- Biologists backed up these ideas with sketches and models based on known animals.
An explicit statement is one that leaves nothing to the imagination. It states facts that are not open to interpretation.
The stated facts are clearly understood. In the third option, the author states a fact that is easily understood and that is not prone to interpretations.
It is just a clear fact that the Biologists backed up their ideas with sketches and models.
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You can use gestures to emphasize key points. Volume and tone both include verbal so it isn't those, and then pace is how fast you move which usually doesn't affect key points.
