Five Mass Extinctions took place, which lowered the variety of species found on Earth today. The five mass extinctions were: End Cretaceous, End Triassic, End Permian, End Ordovician, End Devonian. Scientists this we are now living through the 6th mass extinction.
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The correct answer is panicky.
The author himself says that there were a lot of things around him that made him feel nervous, or the exact word he used is - panicky. I don't know the context, however, based on this excerpt it seems that he went through something dangerous or tragic that made him feel panicky about many things around him.
Answer:
Tap "Praises"
Slide the praise to the left and tap "Delete"