The researcher believes that it is really a rare experience that having an opportunity of studying about actual animal tissues that have been removed to the minerals. Any way, the lecturer disagrees with this statement because the evidence that shows the fossils show that they contain organic matter, which is far from the actual fact.
First, the lecturer explains that breaking up the bone does not describe blood vessels placement. This is because of the fact that the hollow space does not always represent the place where blood vessels have been placed. Well, people can misunderstand about the space because the space can be hollowed like the space that blood vessels were placed with remains of bacteria. This counters the reading passage's claim that blood vessels can be located in the bone.
Second, the lecturer explains about the fact that red blood cells are not the only factors shown as a reddish substance. This is because other matters that show reddish color can be minerals. As you can see, the fact that the inner bones showing the color do not mean they are the organic matter of the red blood cells. This counters the reading passage's claim that red blood cells shown as a matter have color of red.
Third, the lecturer explains that collagen is not the clear evidence that can explain the matter from the dinosaur leg bone. This is because researchers should touch the bone for collecting information and this means that their collagen could be remained in the bone. This counters the reading passage's claim that test of the dinosaur leg bone shows that the bone contains collagen on it.