Respuesta :
1. A lizard is cold blooded. This means that it rely on its surroundings to regulate it's body temp. Normally if a lizard needs warmth they rely on the sun, but in the cold months in many places the heat from the sun isn't enough to be a counter effect of the cold/wind. Sometimes the sun isn't even out at all. Because of this it will A. Retreat to an underground burrow to keep warm
2. Endotherm animal is another name for warm-blooded (mammals are a great example of endotherm animals). If you think of your self, a human (at least I hope you are...) then you don't have to worry about the external temperature regulating your internal temp. You don't have to stay in the sun to keep warm or live underground (D. is just ridiculous that it should be obvious that it isn't the answer, so I'm not even going to talk about it). Your body, and all other endotherm animals generate their own body heat, therefore the answer is C.
Hope this helped!