Q: Reactant concentrations are highest at which part of a reaction? Choices: - ending - middle - concurrent - beginning A:
beginning

Q: Friction does negative work and removes some of the energy the person expends and converts it to which kind of energy? Choices: - erosion - hydro - evaporation - thermal A:
thermal

Q: Q: Acceleration is a vector, and thus has a both a magnitude and what else? Choices: - temperature - pressure - wavelength - direction A:
A: direction

Question: Q: Radioisotopes may vary greatly in their rate of decay, decaying faster if their nuclei are more what? Choices: - mature - immature - stable - unstable A:
Answer: unstable

*Question*
Q: Mammals are endothermic vertebrates that have four limbs and produce what type of eggs? Choices: - gymnoic - umbilical - epithelial - amniotic A:
**Answer**
amniotic

(Question)
Q: The epidermis consists mainly of what type of cells? Choices: - cytoplasm - blood cells - crystalline - epithelial A:
(Answer)
epithelial