How are sister chromatids and homologous chromosomes different from each other?

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).

What is used to keep track of the gamates and possible offsprings combination

Which example would the nurse consider to be a part of systems thinking theory?