The mouth physically breaks down food through chewing. What is in the mouth that begins the chemical breakdown of carbohydrates?
A. pharynx
B. tongue
C. teeth
D. saliva

format change of dna.  

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

hey, what do you need . just post the question and i may be able to you : )