What are the signs of the first period?// I already have lower abdominal pains and my body is changing?

The influenza virus cause the flu, but not other diseases. why?

Internal feedback works to maintain homeostasis when your a. heart rate decreases as your white blood cells increase b. breathing rate decreases as your red blood cells decrease c. heart rate increases as your liver is cleaning blood d. breathing rate increases as your heart rate increases

What is a group of organisms called