▶ Your Answer :
In the reading passage, there is ample support for the
author's claim that there are several plausible evidences that dinosaurs were
endotherms. However, the professor in the lecture gives several reasons as a
rebuttal to the author's point.
First, the professor
contends that dinosaur's fossils of the polar region cannot prove the
dinosaur's characteristics. the polar region might have been warmer than today.
In addition, the dinosaurs would have migrated from the polar region to the
warmer place because of the cool temperature. Furthermore, they would have done
hibernation. This casts doubt on the reading passage's claim that the
dinosaur's fossils of the polar region indicate the dinosaur's enodothermity
because only active endotherms active in such cold climates.
Next, the professor
insists that it is not reliable that position and movement of the legs tells us
that the dinosaurs were endotherms. Because the dinosaurs' body was very large,
it cannot be accounted for the correlationship between endothermity and
position and movement of the legs. This counters the reading passage's
assertion that position and movement of the legs located underneath a
dinosaur's body is the evidence of the endothermity since this position works
efficiently only to the endotherms.
Finally, the
professor argues that the bone structure cannot explain whether the dinosaurs
are endotherms. the dinosaurs have growth ring in their bone, which indicates
that the dinosaurs' bone do not grow up rapidly. In detail, the growth ring
shows that the bone grew slowly during cooling periods. This refutes the
reading passage's suggestion that the dinosaur's endothermity is related to
their bone structure considering Harversian canals which allow the living
animal to grow quickly.
|