DNA is the correct answer
The answer is smell. the rest are intensive
<span>The role of Carotene and Xanthophyll in photosynthesis is the transportation of nutrients. Although photosynthesis can happen in different ways in different species, some features are always the same. For example, the process always begins when energy from light is absorbed by proteins called photosynthetic reaction centers.</span>
I believe the answer is is that it blocks messages within the nervous system, because pain is perceived in the brain through messages sent from the nervous system.
