Case study 10-a: john is a 52-year-old factory worker. he has been admitted to the hospital and presents with muscle weakness and inflammation of his mouth. he is a bit confused and states that he isn't drinking now although he has a history of alcohol abuse. he has lost quite a bit of weight in the last six months, and his dietary intake has been poor. he was laid off a year ago but he is back to work part-time. further testing has been ordered to determine the cause for concern and confirm the diagnosis.

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i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.

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