Increased atmospheric carbon dioxide will diffuse to the ocean water (since normally, there is lower concentration of dissolved carbon dioxide in the ocean water). The dissolved carbon dioxide takes into the form of carbonic acid thereby increasing acidity of ocean water. More often than not, the acidification of ocean water leads to detrimental results especially in marine organisms that are pH sensitive such as coral reefs and many invertebrates.
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I would say that B) single events or several causes working together to produce extinction in a short period is referred to as mass extinction, but I am not 100% sure.
Two things that can occur is water levels may rise and the earth can get warmer.
The answer in the space provided is the preserved bacteria. It is because most foods are chilled in order to prevent the food from spoiling but in the same time, the bacteria that resides in the food, especially in meat products, are being preserved. In order for it to be killed, it is best to cook it thoroughly and properly, in order for the bacteria to be killed and safe for the people to consume.
