What is name for the fibrous double-walled sac in which the heart is enclosed?
a. endocardium
b. epicardium
c. myocardium
d. pericardium

answer; genes dictate the production of specific enzymes, and affected individuals have genetic defects that cause them to lack certain enzymes;

1 true

2 true

and 3 true im assuming these are true or false. hope this