What is the work of teeth?

Which part of Africa is most prone to infectious diseases? Name the two structures that leave permanent imprints in the lobes of the left lung of humans? How does lasik work? How do you tell a female woodlouse is pregnant? For every white blood cells how many red blood cells? Is the part of the cell contains the allele for cystic fibrosis the nucleus? Which two muscles form a stirrup under foot to balance between inversion and eversion? What are Angry veins? What is the function of spikes? How do people get the nerve to commit suicide? Why do people sleep on their sides? Is humalog long lasting insulin? What stimulates osteoclast activity? if you had a high fever last night and now your temperature is 96.9 should you be seen for possible pnuemonia? What bone is connects to one bone to another bone? What is the name of bacteria that cause disease? What if shoplifting is related to anxiety? What is hydrocephalus and disability percentage? How does hypothermia affect sporting performance? Ive had no period for 3 months all 3 pregnancy tests have been negative.For the past 8 days i have experienced bad period pains and have had a bloated stomach for 4 days...can anyone advise on this?