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 do ocean mollusks use to absorb oxygen from the water? A:

OPTIONS:
- shells
- scales
- pores
- gills

Answer: gills

Problem: OPTIONS:
- Pluto
- Saturn
- Mercury
- mars
Q: Q: What is the fourth planet from the sun? A:
Answer: mars

Problem:OPTIONS:
- acids
- bases
- enzymes
- hormones

Q: Low levels of thyroid hormones in the blood cause the release of what by the hypothalamus and pituitary gland? A:
****
A: hormones

Q: Why are seeds of a pine cone easily carried by the wind and dispersed? A:
OPTIONS:
- seeds are sticky
- seeds are small
- seeds are dense
- seeds have wings
seeds have wings

Q: Carbon dioxide is an example of a material that easily undergoes what? A:
OPTIONS:
- decomposition
- spontaneous mutation
- amplification
- sublimation

Answer:
sublimation