▶ Your Answer :
Both the lecturer and the writer discuss
with whether the dinosaurs are endotherms or not. Endotherms are animals who
can balance their body temperatures. The writer claims that dinosaurs are
endotherms by giving three evidence: polar dinosaurs, dinosaurs’ leg position
and movement, and haversian canals. However, the lecturer casts doubt with these proofs, by suggesting that dinosaurs are not endotherms.
First of all, the lecturer asserts that
dinosaur fossils found in polar region cannot prove the fact that dinosaurs are
endotherms. According to the professor, the age of dinosaurs was warmer than
today. In other words, the weather in polar was proper for dinosaurs living. This
goes against the reading passage’s argument that dinosaurs are endotherms
because their fossils have been found in polar region and only endotherms can
sustain the region's cold weather.
Second, the lecturer argues that the reason
why dinosaurs' legs are positioned underneath its body is because this position
helps dinosaurs to support their weight. These enable dinosaurs to grow to
large size, and being large size allows several life advantages. This rebuffs
the reading passage's assertion: dinosaurs have legs underneath their body like
endotherms.
Last, the lecturer agrees the existence of
haversian canals in dinosaur bodies, but disagrees that the canal indicates
that dinosaurs were endotherms. The lecturer says growth rings, which is also
found in dinosaur bones, shows different growing patterns from weather
diversities. On the other hand, endotherms keep the patterns same. This differs
with the reading passage's claim that the existence of haversian canals
strongly evince the fact that dinosaur is endotherms.
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