What might happen to the finch populations after millions of years

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are

What are 3 reasons that natural selection occurs

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?