input with options: Q: What substance are physical objects are made of? A:
OPTIONS:
- gravity
- energy
- friction
- matter
output: matter

Q: Q: What is the name of the hollow nerve cord along the back of chordates? A:

OPTIONS:
- zetacord
- mesoderm
- phloem
- notochord

A: notochord

input: OPTIONS:
- chamber
- ventricle
- the epidermis
- the atria Now, answer this question: Q: What receives blood in the heart? A:
A:
output: the atria

Q: In a chemical reaction, the amounts of reactants and products will be constant when what state is attained? A:

OPTIONS:
- saturation
- peak
- homogeneity
- equilibrium

Answer: equilibrium

Problem: OPTIONS:
- tissue
- collagen
- dendrites
- cilia
Q: Q: The tiny hair present on mucus membranes is known as? A:
Answer: cilia

Q: What helps represent age-sex structure of the population? A:

OPTIONS:
- habitat chart
- density graph
- biome model
- population pyramid

Answer:
population pyramid