Problem:OPTIONS:
- heat
- wind
- rain
- gravity

Q: What makes soil and rock particles move gradually down the slope during each thaw? A:
****
A: gravity

Q: What is an ion that is in common to both salts in a solution? A:
OPTIONS:
- regular ion
- strong ion
- native ion
- common ion
common ion

Q: What is the name of the iron-containing oxygen-transport protein in the red blood cells of all vertebrates? A:
OPTIONS:
- plasma
- platelet
- ferric acid
- hemoglobin

Answer: hemoglobin

Question: Q: What is the process for developing knowledge called? A:
OPTIONS:
- evolution
- theory
- creationism
- science
Answer: science

input with options: Q: The mass of the objects and the distance between them affect the strength of what universal force? A:
OPTIONS:
- states of matter
- weight
- motion
- gravity
output: gravity

Problem: OPTIONS:
- electron production
- proton transport
- glucose transport
- electron transport
Q: Q: What is the final stage of aerobic respiration? A:
Answer:
electron transport