How has each person with bird flu contracted the virus

Contact with infected bird feces, nasal secretions, or secretions from the mouth or eyes.

the answer will be a) proteins i believe

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.