Descent With Modification is extremely prevalent in ratites. They evolved from a common ancestor and began evolving and changing gradually for a long period of time. As they were moved to new habitats after Pangea, they were forced to change and adapt to their surroundings. They had to learn to thrive in their new environments living along with other organisms in the community and make the necessary changes to come out on top.
Natural Selection is found in ratites through the method of directional selection. This means that one extreme form of the trait is the most fit for the organisms. For example, the Ostriches with longest and strongest legs are most likely to survive and be the hunters instead of the hunted. The kiwis with the longest beaks are the most fit and the best at finding food and surviving. Directional Selection hasaffected the evolution of ratites immensely.
Natural Selection is found in ratites through the method of directional selection. This means that one extreme form of the trait is the most fit for the organisms. For example, the Ostriches with longest and strongest legs are most likely to survive and be the hunters instead of the hunted. The kiwis with the longest beaks are the most fit and the best at finding food and surviving. Directional Selection hasaffected the evolution of ratites immensely.