Which of the following are physical barriers to speciation?

You hang a new anti-squirrel bird feeder up in your yard. At first, the contraption seems to work, but after two weeks of unsuccessful trial & error the squirrels have devised a complex strategy to get the seeds inside. This problem-solving behavior required: awareness of the obstacles and potential rewards, memory of what strategies have failed in the past, and  reasoning to develop new approaches. This is an example of…

A cat who has learned to associate the sound of the can opener (arbitrary stimulus) with receiving food (reward) is an example of…

Speciation rates increase with geographic area because

1.9 The current account of South Africa’s balance of payments shows income …. (2)

Which statement BEST describes the relationship between an enzyme and a reactant molecule?

Enzymes are catalysts because they operate to

“A change in allele frequencies over time” describes…

Humans and Chimpanzees share 98.4% of their genes in common.  Humans and Dogs share 84% of their genes in common.   This indicates that…

When a small population experiences a change in allele frequencies from one generation to the next as a result of pure random chance it has undergone…