TASK DEFINITION: Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.
PROBLEM: Question: The joints of the carpal bones in the wrist are examples of what type of joints? Answer: planar joints

SOLUTION: Figure 38.27 The joints of the carpal bones in the wrist are examples of planar joints. (credit: modification of work by Brian C. Goss).

PROBLEM: Question: The number of electrons in the outer energy level determines what property of nonmetals? Answer: reactivity

SOLUTION: Some nonmetals are very reactive, whereas others are not reactive at all. It depends on the number of electrons in their outer energy level.

PROBLEM: Question: What is the total number of codons? Answer: 64

SOLUTION:
The mRNA is divided into three-base segments called codons. A codon is the segment of nucleotides that codes for an amino acid, or for a start or stop signal. There are 64 codons.