Answer:
A person who receives a gene for sickle cell disease from one parent and a normal gene from the other has a condition called "sickle cell trait." Sickle cell trait produces no symptoms or problems for most people. Sickle cell disease can neither be contracted nor passed on to another person.
Answer: Water is polluted
Explanation: Im so sorry if this is wrong btw but im pretty sure its right
<span>radioactive zone & convection zone i think
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