An example of a parallel choice on a dichotomous key
a. old or young
b. happy or sad
c. brown hair or black hair

it would be the percentage of food eaten by the flock

i remember doing this lab

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