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When describing down syndrome, it's important to note that __________. a. it can be classified as a single-gene disorder b. it is caused when red blood cells cannot properly form hemoglobin c. it causes infected males to have low testosterone levels d. it is usually caused by three copies of chromosome 21 please select the best answer from the choices provided. a b c d

User Chris Pacey
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17 votes

Answer:

B

Step-by-step explanation:

User Rashack
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