1.
article/2111027-plants-see- underground-by-channelling- light-to-their-roots/amp
2.
3.
Plants ‘see’ underground
by channelling light to their roots
https://www.newscientist.com/2.
Every year of smoking
causes DNA mutations that make cancer more likely -
http://www.latimes.com/science/sciencenow/la-sci-sn-smoking-cancer-mutations-20161103-story,amp.html3.