It is not, 'imminent,' since the ozone layer in the atmosphere is slowly repairing itself. However, that being said, there is lots the human race can do to stop global warming. It may have more effect in 30 years time, but, if humans do enough, we can stop worrying. Renewable energy is a good idea to prevent global warming. Since most of it is generated from Co2 emissions from generating power. Electric cars are also good, because if we can make renewable energy (such as wind or solar power, or hydroelectric power for that matter) to power them, they will not produce emissions either.
Crossing over is a biological occurrence that happens during meiosis when the paired homologs, or chromosomes of the same type, are lined up. Hope this helps :)
An estuary is partly enclosed coastal body of water with one or more rivers flowing through it, and with a free connection to the open sea. it would be more of a collection. hope this help have a great day.
