Anatomists

1. Anatomists

2. Organisms that are related have similarities that all come from common ancestors. The similarities are known as homologies. • comparing anatomies of different living things • seeing the similarities and differences in the cells • analizing embryological development • studying vestigial structures within individual organisms.

3. Evolution Makes Sense of Homologies Vestiges are parts of an organism that are no longer in use and are shrinking, like the pelvis on a whale. Pentadactyl limbs are found on tetropods and its supposed to have 5 digits. New functions evolve from pre-existing structures, which is how an animal would acquire a wing, like a bat.

4. Example of Homologies

5. All have the same basic components and they all come from a common ancestor

6. Comparative Anatomy This is just the process of comparing and contrasting different anatomies of species

7. Comparative anatomy

8. Comparative Anatomy

9. Evidence Supporting Biological Evolution Some common structures, or homologies, on animals would be a human arm, and mouse limb, and a bat wing- all designed for different purposes but are all similar in structure and design.

10. Developmental biology

11. Developmental biology

12. Vestigial - A feature that an organism inherited from its ancestor but that is now less elaborate and functional than in the ancestor.

13. Vestigial structures