Which is true? a. in long bones, the epiphyseal line is sharper as we age. b. in long bones, the epiphyseal line disappears as we age. c. in long bones, the head and shaft fuse as we get older. d. b & c

In longer bones epiphyseal line sharpens as we age . The epiphyseal plate a part of bone ossifies or hardens and becomes the part of the bone. As the plate ossifies an epiphyseal lina is formed . Presence of epiphyseal line on the long bones helps to calculate the age of the skeleton.

The answer would be b. it is a learned trait

If it doesn't have a nucleus its a prokaryote