Variations in body structure, or function, or behaviour, which give some members of a species a survival advantage and hence increase their chances of leaving more surviving offspring than other members of the same species.
Making the decision to study can be a big step, which is why you'll want a trusted University.
The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now.
Take a look at all Open University courses.
If you are new to University-level study,
we offer two introductory routes to our qualifications. You could either choose to start with an
Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on
Where to take your learning next for more information.