30 points! peter and rosemary grant: what did they observe? what did they conclude? brief goals they studied.

Peter and Rosemary Grant are distinguished for their remarkable long-term studies demonstrating evolution in action in Galápagos finches. They have demonstrated how very rapid changes in body and beak size in response to changes in the food supply are driven by natural selection. They have also elucidated the mechanisms by which new species arise and how genetic diversity is maintained in natural populations. The work of the Grants has had a seminal influence in the fields of population biology, evolution, and ecology.

https://en.m.wikipedia.org/wiki/Peter_and_Rosemary_Grant

Hope this helped!!!
~Xoxo Melis