During which period did eurypterids swim the oceans and the first jawed fish and vascular plants evolve?

Answer 1

The Silurian Period

The Silurian period lasts from about 440 to 410 mya. Eurypterids resembled giant water scorpions, usually measuring 5 to 17 inches, but the biggest (Pterygotus) reached 6 to 8 feet in length.

A relatively short period in geological history. A time of stabilization of global temperatures. The Silurian period is the first period in history where fish begin to appear in the fossil record. A time of the first terrestrial animals. http://go2add.com/paleo/eurypterids.php

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.