An item in America that demonstrates cultural diffusion?

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.

Answer (b) they're often rural migrants with no title to housing or rights to established businesses

Answer lake victoria

Bcold,less-dense air falls