Your six friends are now exploring Ellsmere Island in Canada. On this Island, in 2005, scientists discovered the fossil of Tiktaalik roseae, a famous “transition fossil” between swimming fish and four legged vertebrates (the tetrapods). Your friends begin to discuss Tiktaalik’s (pronounced tik-TAA-lik) origin.
This is what they said:
Courtney: “Obviously, there was not enough food in the sea, so a mutation occurred and that caused Tiktaalik to be able to go on the land.”
Jose: “Courtney, I agree with you. Tiktaalik must have needed to develop fins that were capable of supporting movement on land.”
Raquan: “You two might be onto something. Clearly, Tiktaalik encountered a changing environment and it adapted to it.”
Mike: “Yeah, Raquan, once it acquired the trait of fins capable of supporting movement on land, as Jose suggested, it passed them onto its offspring.”
Keisha: “Alright, so then do we think this is an example of evolution? If so, then this form must have evolved into the tetrapods we see today over a very long time.”
Alex: “Keisha, I agree with you that this process of change took a long time, but I’m not so sure if Tiktaalik evolved into the tetrapods we see today. If Tiktaalik is a fossil, it should be extinct.”
Based on each person’s statement, identify if you agree or disagree by placing an X in one of the columns on the chart on the back and then explain your reasoning.
Sat Jan 15 2022 20:30:36 GMT-0500 (EST)