input with options: Q: Enzymes - proteins which speed up what? A:
OPTIONS:
- crystals reactions
- liquid reactions
- physical reactions
- chemical reactions
output: chemical reactions

Q: Q: Which blood vessels is oxygen transferred through? A:

OPTIONS:
- cilia
- arteries
- veins
- capillaries

A: capillaries

input: OPTIONS:
- deep slope
- close slope
- flat slope
- steep slope Now, answer this question: Q: What do contour lines that are close together indicate? A:
A:
output: steep slope

Q: What organizational tool, arguably the best in all of science, lists all the known chemical elements, arranged by atomic number? A:

OPTIONS:
- tide table
- logic table
- spreadsheet
- periodic table

Answer: periodic table

Problem: OPTIONS:
- producer
- secondary
- apex
- trophic
Q: Q: Energy transfer between what kinds of levels is generally rather inefficient? A:
Answer: trophic

Q: Because sound waves must move through a medium, there are no sound waves in a what? A:

OPTIONS:
- solid
- liquid
- gas
- vacuum

Answer:
vacuum