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How many possible unlock codes are there on a phone with a 4 digit unlock code and numbers can be repeated? Example: 1111 is allowed. 

Chemicals released by damaged cells, white blood cells, and platelets act to attract white blood cells to the area. What is this attraction called?

A patient is severely malnourished. The lack of dietary protein has caused a deficiency in plasma proteins. Which symptom would you expect to see as a result?

Facing prejudices about children __________.

 The use of erythropoietin (EPO) is banned for use by Olympic and professional athletes. Why would an athlete what to take EPO?

Teachers of young children have nothing in common with teachers of elementary and high school students.

P(A) represents the probability of someone having blue eyes. If P(A) = 0.25, what does the complement represent and what does it equal? 

 Cytotoxic T cells target and destroy __________.

 What type of blood cell is biconcave and lacks a nucleus when they are mature?

 Lymph eventually is returned to the circulation at what blood vessels?