Answer:
C is your answer
Explanation:
Both sexes have a X chromosome, the zygote must have at least one X.
Answer:
In the lungs breathing can be easier when not filling it with unnecessary toxins, the consequences of people at high altitudes slow asphyxiation if the altitude is high enough, headaches, hallucinations, blackouts and other symptoms if it's not as extreme.
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Answer:
AA is labels would correctly model photosynthesis
