This material addresses the question of whether the researchers found actual tissues of Tyrannosaurus rex. The reading passage suggests three arguments to support the view that the leg bone of the dinosaur contained remains of blood vessels, red blood cel

This material addresses the question of whether the researchers found actual tissues of Tyrannosaurus rex. The reading passage suggests three arguments to support the view that the leg bone of the dinosaur contained remains of blood vessels, red blood cells, and collagen. The lecturer, on the other hand, refutes this information by stating that the found material is something else. To begin with, the reading passage highlights that the soft substance found in the bone may be the remains of the dinosaur's blood vessels. Meanwhile, the professor casts doubt on this and argues that the corresponding material may be the residues of bacteria’s colonies, as bacteria may have filled the space after the animal's death. Additionally, the article posits that the spheres discovered in the bone might be the remains of red blood cells. However, the professor advocates a different approach and provides the following details. Namely, he mentions that similar spheres were found in the fossils of primitive animals - a fact, that undermines the validity of the mentioned argument, since the primitive animals are proved not to have red blood vessels. Finally, the author invites attention to the fact that the dinosaur's leg bone contained collagen, which is associated with bone tissue. This goes counter to the information in the listening passage, according to which, collagen does not last longer than 100, 000 years which was not the case. The professor suggests that collagen may have originated form skin of the researchers who found the bone.