input: OPTIONS:
- display membranes
- ribosomes
- nuclei
- plasma membranes Now, answer this question: Q: All cells have voltages across their what? A:
A:
output: plasma membranes

input: OPTIONS:
- gravity
- waves
- depletion
- extinction Now, answer this question: Q: Ice ages, continental drift, and giant meteorites striking earth have caused what phenomenon? A:
A:
output: extinction

input: OPTIONS:
- stomach acid
- insulin and pepsin
- bile
- digestive enzymes Now, answer this question: Q: What are secreted into the gi tract by organs of the gi tract or from a nearby gland named the pancreas? A:
A:
output:
digestive enzymes