Which of these principles is common to both lamarck’s and darwin’s theories of evolution?
species developed new features in order to survive in a changing environment.
all organisms are related to and descended from a common ancestor.
environment selects who will survive by allowing the best adapted organisms to survive.

Both recognised that species developed new features in order to survive in a changing environment.
Lamarck thought characteristics acquired during a species lifetime could be passed onto offspring, while Darwin thought this was a very gradual change over many generations, but both knew that features which enabled a species to cope with changed conditions in the environment increased in presence overtime.

The answer would be d because x,y = male and x,x = female so x,y is male so xxy is male with a female trait!