Hiv infection through blood transfusions is very rare in the us because all donated blood is carefully screened.

menstruation is a process in which blood and mucous flows out every month through the vagina. this process occurs every month because one egg is released from the ovary every month and at the same time, the uterus (womb) prepares itself to receive the fertilized egg.

explanation:

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relationship between pressure and air volume and led to the understanding of how respiration works; i believe this is the correct answer ; /// good luck