input: OPTIONS:
- calcium
- white blood cells
- acid
- ph Now, answer this question: Q: When food enters the stomach after a period of fasting, a drop in what initiates the conversion of pepsinogen to pepsin? A:
A:
output: ph

Q: What organs filter blood and form urine? A:

OPTIONS:
- the appendix
- the spleen
- the liver
- the kidneys

Answer: the kidneys

Problem: OPTIONS:
- blood
- methane
- yeast
- an alcohol
Q: Q: The reaction of an alkyl halide with an inorganic hydroxide base at elevated temperature produces what? A:
Answer: an alcohol

Problem:OPTIONS:
- adult stages
- intermediate stages
- both
- all

Q: What stages in the life of a cell does the cell cycle include? A:
****
A: all

Q: What returns blood from capillaries to an atrium? A:
OPTIONS:
- the lymph system
- arteries
- the liver
- veins
veins

Q: Osmotic pressure is important in biological systems because cell walls are what? A:
OPTIONS:
- impassable
- theonym membranes
- variably membranes
- semipermeable membranes

Answer:
semipermeable membranes