*Question*
Q: Animals can transport what waste material in the circulatory system and store it safely at high concentrations? Choices: - proteins - carbon - phosphorus - urea A:
**Answer**
urea

*Question*
Q: Vertebrates with four limbs are also called what? Choices: - Amphibians - Birds - Mammals - tetrapods A:
**Answer**
tetrapods

*Question*
Q: What type of energy causes erosion at the shore? Choices: - tidal - potential - kinetic - wave A:
**Answer**
wave

*Question*
Q: Temperature is a measure of the motion (kinetic energy) of what? Choices: - particles - nucleus - electrons - molecules A:
**Answer**
molecules