*Question*
Birds are endothermic tetrapod vertebrates, and legs define Tetrapods. Given these facts, what are endothermic vertebrates with legs among the following options: - Birds - mammals - Snakes - ducks - Lizards - ants - long - toads
**Answer**
Birds

*Question*
Shivering occurs when many muscles contract a little bit all at once, and another response to cold is shivering. Given these facts, many muscle fibers contracting at once can be induced by among the following options: - exposed genitalia - exposure to heat - sweating - exposed biceps - mechanical waves - Electrical energy - exposure to cold - Veins and arteries.
**Answer**
exposure to cold

*Question*
Tectonic plates being pushed together causes earthquakes, and several tectonic plates make up the earth's crust that are in a constant state of process. Given these facts, parts of the Earth's crust being pushed together causes what among the following options: - magnetic shifts - erosion - friction - earthquakes - solar flares - moonquakes - global warming - Sediment
**Answer**
earthquakes

*Question*
Muscles can only contract, and smooth muscles are involuntary muscles. Given these facts, something that can be described as what can only contract among the following options: - Smooth - the skin - Rough - strong - Sweet - Loud - complex - alveoli
**Answer**
Smooth