input: OPTIONS:
- chambers of the heart
- digestive organs
- arteries
- pairs of capillary beds Now, answer this question: Q: Portal veins carry blood between what? A:
A:
output: pairs of capillary beds

Q: What is a process in which some substances change into different substances? A:

OPTIONS:
- a toxic reaction
- a bio reaction
- a thermodynamic reaction
- a chemical reaction

Answer: a chemical reaction

Problem: OPTIONS:
- geomorphology
- heredity
- lithography
- biogeography
Q: Q: What is the study of how and why plants and animals live where they do? A:
Answer: biogeography

Problem:OPTIONS:
- a colony
- a habitat
- a biome
- a community

Q: The populations that live in the same area form this? A:
****
A: a community

Q: What is the term for the number of waves that pass a fixed point in a given amount of time? A:
OPTIONS:
- wave speed
- wave distance
- wave velocity
- wave frequency
wave frequency

Q: Which process or force pulls rocks apart? A:
OPTIONS:
- tactile stress
- friction stress
- composition stress
- tension stress

Answer:
tension stress