*Question*
Q: What's the most common disorder from having an extra chromosome? Choices: - Williams syndrome - Turner syndrome - cri-du-chat syndrome - down syndrome A:
**Answer**
down syndrome

*Question*
Q: Name the plant considered to be the ancestor of plants? Choices: - brown algae - ferns - grass - green algae A:
**Answer**
green algae

*Question*
Q: What creates wet and dry zones at different latitudes? Choices: - jet stream - trade winds - horse latitudes - global air currents A:
**Answer**
global air currents

*Question*
Q: When additional water is added to an aqueous solution, what happens to the concentration of that solution? Choices: - doubles - no change - increases - decreases A:
**Answer**
decreases