*Question*
Q: What kind of anatomical structure consists of several types of tissues that together carry out particular functions? Choices: - valve - frame - system - organ A:
**Answer**
organ

*Question*
Q: The temperature of the products is typically lower than the temperature of the reactants in what type of reaction? Choices: - autotrophic - exothermic - parabolic - endothermic A:
**Answer**
endothermic

*Question*
Q: Air conditioning systems can incubate certain bacteria and what else? Choices: - Cancer - wood - root - mold A:
**Answer**
mold

*Question*
Q: What happens to meteors as they fall through the mesosphere? Choices: - they grow - they bounce - they stop suddenly - they burn A:
**Answer**
they burn