I would say d; not entirely sure
Answer:
Introduction of good farming practices
Growing crops that don't require a lot of water
Building of green houses
Explanation:
My name is jeff and idk about the answer
Not completely sure but logically people go to cities to find jobs :) hope this helps
Answer:
Ordovician extinction
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Explanation:
The Ordovician extinction was an event that occurred around 450 million years ago and caused the <u>disappearance of 60% of marine species.</u>
This event was caused by global cooling which resulted in the <u>drop of the sea level</u>. This change mostly affected the species that developed life in the deep, depriving them of their natural habitat.
