What is a cash crop? Something to be consumed by the local people and sold for cash
O Crops that are specifically grown to be exported around the world
Crops that are used to make paper money
O Crops that are grown in someone's backyard to be traded locally

Ba population changes in response to a change in environment

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.