Question

reread the sentences from the passage. this leg was specifically designed for rock climbing and has many features that can help the climber, such as the spiked foot, which grips the rock face better than any biological foot could. other prosthetics can help people excel at the sports they love, too. engineer hugh herr has made this his lifes work. what does the word this refer to? strengthening biological limbs teaching rock climbing designing prosthetic limbs discovering challenging rock faces engineer hugh herr has made? his lifes work.

Explanation:

The passage describes a prosthetic leg designed for rock - climbing and then mentions Engineer Hugh Herr. The context indicates that his life's work is related to what is described before, which is designing prosthetic limbs.

Answer:

designing prosthetic limbs