Evolution Explained Part 2
It is very important to note that a “species” makes these changes. It’s often not the same animal, human, or plant that does this. Bodily adjustments could happen in this case but nothing more, outside of man-made aids or additions. An example of that would be something like glasses we use to help us see better. This means that the characteristics and changes are “heritable,” or passed on from generation to generation.
Each species will add its own adjustment or tweak to fit the present period. We used the example above about how we use glasses to see better. If eyesight needs to improve for a species, it will be able to make this change. In order to live, the eyesight must improve so the species will either adjust to this or die off as a result of not being able to adjust its eyesight.