copper tolerant grass charles darwin?

Answer 1

Yes.
Some grasses have evolved tolerance to heavy metals such as copper, zinc, lead,iron, magnesium.
Studies of copper-tolerant bent grasses showed that
tolerance is inherited and that populations of bent
grass usually contain tolerant individuals.
http://www.nhm.ac.uk/education/activities/school-activities/discovery-guides/assets/TGorigin_of_species.pdf
http://links.jstor.org/sici?sici=0028-646X(197309)72%3A5%3C1041%3AZLACTI%3E2.0.CO%3B2-I