The reading passage talks 
about sea otters declining while 
professor doesn't agree with that.

In the reading passage, it says the pollution and predator 
attacks cause the sea otters to decline. 
But the professor asserts otters are 
still found which it didn't impact on declining.

Second, the reading passage says other 
species have declined too. Perhaps the lecture 
mention about whale hunting.

Finally, uneven pattern ocean currents have 
caused sea otters declining. Well, the 
professor didn't agree with it which 
means ocean currents didn't affect the population.