Question: currently hunting pressure is mercifully low on cheetahs one group...
Currently, hunting pressure is mercifully low on cheetahs. One group of researchers studying one particular population of cheetahs is interested in how leg-length is changing over time. As it turns out, from a bio-mechanical perspective, longer legs allow cheetahs to run faster and catch more prey. However, very long legs also fracture more easily. Given this, scientists have observed only small changes in overall leg-lengths over time. In this same study, these scientists also observed changes in the leg lengths of the gazelle that cheetahs eat in ways that correspond to changes in cheetah leg lengths.
Which of the following concepts are illustrated in this description of current cheetah populations in Africa?