The neck is a

a. first class lever
b. second class lever
c. third class lever
d. fourth class lever

what subject is this

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics

which

the answer is 100% density i've answered this question before and done the quiz myself.