This is because Aristotle believed that purposive final causes guided all natural processes. He classified organism according to their traits, but there was many problems of Aristotle’s limited classification because some organisms didn’t fit the group.
For example, he put birds, bats, and flying insects in the same classification group because of their ability to fly, but today we know that they have little in common. He also distinguished animals with blood and animals without blood.
Cell fractionation allows to study the different parts of a cell in isolation.When the organelles have been isolated, you can see which organelles make the most energy.
