Answer:
People with type O- blood are called universal donors because their donated red blood cells have no A, B or Rh antigens and can therefore be safely given to people of any blood group.
Answer:
d. Sends messages about your environment to the brain.
Explanation:
i don't have an explanation, i just know it from last year's health class.
An infection from a bacteria or germ called H. pylori :)
The last one is correct...
Please vote my answer branliest! Thanks.