In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Most orangutans are _ to five feet long, some can reach a length of six feet.
[A]: four


[Q]: Covalent bonds arise when _ atoms share electrons .
[A]: two


[Q]: Porcine insulin has _ different amino acid and bovine insulin has three different amino acids.
[A]:
one