TASK DEFINITION: Given a scientific question, generate a correct answer to it.
PROBLEM: Many species secrete a hard external skeleton of what?

SOLUTION: calcium carbonate

PROBLEM: What helps the plasma membrane keep its shape?

SOLUTION: molecules of cholesterol

PROBLEM: Name the two types of nucleic acids.

SOLUTION:
dna (deoxyribonucleic acid) and rna (ribonucleic acid)