Which part of the digestive system starts the breakdown of proteins? esophagus large intestine small intestine stomach?

What happens when a magniseum ion ia atracked to a chlrene ion

Which of the following best describes the relationship between glucose and complex molecules such as hormones?

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13