The symptom that the client is experiencing is consistent with the deficiency in the Vitamin A which is a dietary element. The vitamin A is responsible for causing dryness to the eyes if a person is lacking this type of dietary element as Vitamin A is the one responsible for providing healthy vision for an individual.
Regulates body temperature.
Moistens tissues in the eyes, nose and mouth.
Protects body organs and tissues.
Carries nutrients and oxygen to cells.
Lubricates joints.
Lessens burden the on kidneys and liver by flushing out waste products.
Answer:
Altruistic behavior, such as sterile worker ants caring for the offspring of their queen, evolves only between related individuals through what is known as kin selection — or so many evolutionary biologists have thought since the 1960s.