Do all exothermic phase changes have a negative value for the entropy change of the system?

Which of the following is a macronutrient? carbohydrates lipids amino acids all of the above

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

Vessels draining the myocardium of the heart, open primarily ,into which chamber?