Mavisdu1017 wrote:
Hello expert,
so they need plants known for their ability to deal with the cold weather, so dinos are not warm blooded (common sense warm blood animals do not need plant to withstand cold weather). Weaken the conclusion.
I don't really understand your reasoning here.
Perhaps the phrase "warm-blooded" is the problem? "Warm-blooded" animals—including humans—have metabolic processes that give off heat, and therefore have a body temperature that's higher than the ambient temperature of their surroundings.
"Cold-blooded" animals, by contrast, warm up or cool off along with their surroundings. Since blood is water-based, cold-blooded animals can't live where temps dip below freezing—their blood would literally freeze in their veins 😳 and they'd all die.
Plants have nothing to do with the distinction between warm-blooded and cold-blooded animals. There are warm-blooded animals that eat plants, and there are also cold-blooded animals that eat plants.
The significance of choice C is that these plants could have been a food supply for our hypothetical arctic dinosaurs. This choice makes it more reasonable that dinosaurs could have survived up there; therefore it
strengthens the researchers' argument!
Quote:
While D says dino would need to migrate to find a continual food supply, but passage never mentions “there is more food supply in northern arctic”.
The passage definitely does not say that. There's very little biomass of any kind way up there, whether it's potential dinosaur food or not.
Choice D, however, says that big herds of dinosaurs
had to keep wandering around, hoping they'd find food. Of course, they wouldn't have any idea whether heading in any particular direction would actually lead them to food—they just had to get lucky!
According to choice D, those fossils could have come from a herd of dinosaurs that made an unfortunate choice, headed in the wrong direction, ended up in the arctic, and starved and/or froze to death (whichever came first). Yikes.