Data Entry - Physics

Which of the following animals possesses a four-chambered heart?

The length of an elastic string is $a$ metre when the longitudinal tension is $4 \ N$ and $b$ metre when the longitudinal tension is $5 \ N$. The length of the string in metre when longitudinal tension is $9 \ N$ is

Which of the following pairs of $2,3$-butanediol are enantiomeric?

The radius of the circle $r = 12 \cos \theta + 5 \sin \theta$ is

$A$ biological catalyst is essentially