Problem: OPTIONS:
- lips and teeth
- fingers and lips
- ribs and nerves
- fingers and toes
Q: Q: Nails cover the tips of what? A:
Answer: fingers and toes

Problem:OPTIONS:
- left-end zeros
- significant digits
- placeholders
- right-end zeros

Q: What do we call zeros that appear after nonzero digits? A:
****
A: right-end zeros

Q: Groundwater does what to the rock beneath the ground surface? A:
OPTIONS:
- accelerates it
- creates it
- boosts it
- erodes it
erodes it

Q: Which gland is located in the sella turcica of the sphenoid bone within the cranial floor? A:
OPTIONS:
- mammalian gland
- thyroid gland
- glucose gland
- pituitary gland

Answer: pituitary gland

Question: Q: Which acids provide the molecular blueprints for all proteins produced in living systems? A:
OPTIONS:
- periodic acids
- amino acids
- nitrous acids
- nucleic acids
Answer: nucleic acids

input: OPTIONS:
- diameter
- mass
- weight
- density Now, answer this question: Q: On what basis are lipoproteins classified? A:
A:
output:
density