"The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago, to the beginning of the Devonian Period, 419.2 Mya.<span> <span>Wikipedia."
https://www.google.com/search?q=He+Silurian+period+occurred&rlz=1C1RUCY_enUS760US760&oq=He+Silurian+...
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They live near the United Startes because northern Canada is mostly ice and water
Answer:
The main contribution of land routes to India in ancient times are :
The main contribution of land routes to India in ancient times are :
(i) Trade.
(ii) Expansion of scientific knowledge.
(iii) Learning of other nations and cultures.
(i) Trade flourished through the land trade routes.