The best answer is A! I hope this helps and I am sorry if I am wrong:(
The ends of the femur are covered in a smooth, slippery substance called articular cartilage. This cartilage protects and cushions the bone when you bend and straighten your knee. The normal anatomy of the knee.
These factors all make up your personality. Hope this helps! :)
Sarah is the (BLANK), and Streptococcus pneumonia is the(BLANK)
