Problem:OPTIONS:
- acid rain
- meteorites
- the Sun
- asteroids

Q: In the past, what colliding with planet earth has caused many organisms to die off? A:
****
A: asteroids

Q: The actinides are all what type of elements? A:
OPTIONS:
- large
- nuclear
- multiple
- radioactive
radioactive

Q: Which theory describes the distribution of electrons in molecules in much the same way that the distribution of electrons in atoms is described using atomic orbitals? A:
OPTIONS:
- molecular distribution theory
- atomic orbital theory
- atomic distribution theory
- molecular orbital theory

Answer: molecular orbital theory

Question: Q: In the body, what essential substance is pumped from the heart into arteries and then eventually into capillaries? A:
OPTIONS:
- spinal fluid
- water
- lymphatic Fluid
- blood
Answer: blood

input with options: Q: Where do most biochemical reactions take place? A:
OPTIONS:
- stomach
- upper atmosphere
- outside of cells
- within cells
output: within cells

Problem: OPTIONS:
- respiratory system
- circulatory system
- lymphatic system
- nervous system
Q: Q: What is the complex network of nervous tissue that carries electrical messages throughout the body? A:
Answer:
nervous system