What was the collective name for the four ancient sporting tournaments in greece?

Hepatitis b and hiv/aids are two serious infections that can be transmitted by a. breastfeeding and contact with blood. b. sharing food and sharing drinks. c. transmission by air, water, and shared bodily fluids. d. skin contact, contact with urine, and sharing clothing.

Blood cells bring oxygen to cells and take carbon dioxide away. true or false

What ingredients used in tobacco products been banned?