One of the characteristics you're looking for is whether the organism is a vertebrate (with a backbone) or an invertebrate (without a backbone).
The decrease of testosterone in males is called andropause. This happens when a man reaches the age of 40 where there is a gradual decrease in their testosterone; about one percent less each year. Symptoms of andropause include, depression, insomnia, increased body fat, and difficulty concentrating.
A) transports oxygen and carbon dioxide for the respiratory system
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your answer is: D)Alkaline solution is not a property of water.
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