What might have happen if these inventions where not introduced to these European countries

Ice melting no wait thats global warming

Answer// dinosaurs emerged during mesozoic era;

Build a market-oriented economy;

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.