Kangaroo rat is found in:

The pairs of straight lines $x^2-3xy+2y^2=0$ and $x^2-3xy+2y^2+x-2=0$ form a

Consider the following statements $A$ and $B$ and identify the correct choice in the given answers.
$A$. Tightly bound electrons of target material scatter $X$-ray photon,resulting in the Compton effect.
$B$. Photoelectric effect takes place with free electrons.

The jawless vertebrate is

$NPN$ transistors are preferred to $PNP$ transistors because they have

The cubic equation whose roots are the squares of the roots of $x^3-2x^2+10x-8=0$ is