Askydiver's parachute fails to deploy. after some struggle, his reserve chute deploys in time to save his life. however, his landing is harder than normal and he feels his knee slightly hyperextend. he shakes it off and goes about his normal routine. later that day he begins experiencing knee pain. two days later he notices that his knee "pops" when he crouches and soon discovers he has dislocated his femur on the knee. what muscle was likely injured initially?

Apopulation is a group of individuals of a single species existing together in an area. a population’s range, the area it occupies, changes over time. populations, in turn, may form a network, or metapopulation, connected by individuals that move from one group to another. within a population, the distribution of individuals can be random, uniform, or clumped, and the distribution is determined in part by the availability of resources. how might the geographic range of a species change if populations could not exchange individuals with each other? how would your answer depend on what type of metapopulation existed?

Bonus question: according to wikipedia, in chinese philosophy yin and yang "describes how seemingly opposite or contrary forces may actually be complementary, interconnected, and interdependent." what are some examples from the story that amy tan may have intentionally incorporated elements of yin and yang philosophy into this story? select 2.

What greek scientist created a screw to move water for irrigation?