I had the same question in Biology)
The theme that explains it is Homeostasis.
An organism unable to balance its internal conditions could become ill and die. They bury into the sand because it is cooler under it. The sun heats only the top part of the sand. So that way they can keep their body temperature they way it should be.
We had the same question for biology. XDD
I wonder...
Its important because the toad wants to keep cool. write out the response yourself. :P It's not that hard.
homeostasis
plant biology
describe the different land regions of Chile?
no
Troposphere
er
I think this will answer you correctly. http://www.tutorvista.com/content/biology/biology-ii/nutrition/human-digestive-system.php
I don't no u tell me
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terrible
You could call them mirror opposites, identifying the same phenomenon in two polar regions.