I would say body language because animals can detect threats
This really isn't a 'Biology' question.
Yes, leaders learn by following others first. Everyone must start somewhere, and the experience of being a follower is something that all should know.
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A. Longer
The shortest wavelength on the left side is Gamma rays. The longest are radio so as you move to the right, it gets longer.
Fossil B would most likely be correct in this situation