First, a review of our “fossils”:
Below are the results from one group (Sam, Mike S, Jack, and Alec). Now, let’s debate! What information do you disagree with? How was your cladogram different/better? What characteristics did you identify and how did you explain them? In your comments, use research-based explanations with links to your evidence!
Ancestors of D, E, I, and J were seperated from the ancestors of A, B, C, F, G, and H because of an earthquake. After several generations, the ancestors of D, E, I, and J developed holes because they needed a way to filter water to eat. Habitat isolation led to these two groups developing new traits to the point where they were no longer able to mate with one another.
Competition for food between D, E, I, and J was really high. Ancestors of species I developed joints so it could walk out of the water to find a new food source. Because species I was symmetrical, it was caught by prey easily. As a result, I became less and less symmetrical so it would not be caught by predators as easily.
Ancestors of species D were pulled by strong currents into an attractive fishing area. They were seperated from their common ancestor between J and E. Fisherman were able to harpoon ancestors of D. Species D became transparent over time to avoid being caught.
The ancestors of E and the ancestors of J began to mate only with those like them, eventually causing them to be too different to mate. This caused visible differences.
The ancestors of species A were the only ones that were moved by a growing mountain into a place where motion was still unecessary. The other species grew joints to leave the water for protection against predators.
The ancestors of species b and g found the presence of symmetrly disgusting and only mated with those who are less symmetrical. The ancestors of H, F, and C only liked those that had symmetry. This eventually led to a split in species.
A group of the ancestors of species B traveled to a forest. This species became transparent to hunt smaller organisms without being seen.
A rare event caused the bulk of the F, H, and C species to be split into three groups when an island was splint in a volcanic event. By the time the volcano stopped erupting, species F, H, and C were no longer able to mate.