The area between the kneecap and the femur

i believe the answer would be a bursa

a bursa cushions the area between the kneecap and the femur.

inside this capsule are pads that cushion the joint. one of those pads is a bursa, a sac filled with a gelatinous liquid that prevent friction between bones in the joint. when the fluid becomes irritated or infected, it is known as bursitis, a condition that can make joint movement painful and stiff in the morning.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

hope this any more questions i am here plz mark brainliest