Q: The ability of a water spider to walk across a body of water is an example of what? A:
OPTIONS:
- high density
- low gravity
- magnetism
- surface tension
surface tension

Q: What is the measure of how closely molecules are packed together? A:
OPTIONS:
- length
- volume
- frequency
- density

Answer: density

Question: Q: What kingdom of organisms constitutes up to 20 percent of all living things on earth in mass? A:
OPTIONS:
- protists
- sporozoans
- vertebrates
- archaeans
Answer: archaeans

input with options: Q: Some hormones produced by the anterior pituitary regulate the production of hormones by other tissues belonging to what system? A:
OPTIONS:
- nervous
- digestive
- cardiovascular
- endocrine
output: endocrine

Q: Q: What is the term for the deepest places on earth? A:

OPTIONS:
- the core
- tunnels
- mines
- trenches

A: trenches

Q: What substances that primarily comprise plasma membranes form a bilayer? A:
OPTIONS:
- amino acids
- enzymes
- steroids
- phospholipids
phospholipids