In the reading material, the author claims a finding which is using the evidence in the dinosaurs' bones to prove it blood vessels, cells, and marrow. And he provides three evidence for the finding. However, the professor in the lecture disagrees with that and gives opposite reasons.

First, the writer of the passage says there are veins surrounding the skeleton so the red things in it would be the evidence. On the other hand, the speaker tells that the evidence is unreasonable. He says the red material is not the blood. For example, if someone put some blood in the toilet paper today, the red blood would become brown after several days. This proves the blood would not keep red for a long time. In the same way, the blood of dinosaur is impossible that their blood could keep red.

Secondly, in the article,