The evolutionary history of an organism is known as .......

An integrating factor of the equation $(1+y+x^2 y) dx+(x+x^3) dy=0$ is

Give the correct order of initials $T$ or $F$ for the following statements. Use $T$ if the statement is true and $F$ if it is false.
$(I)$ Sulphide ions react with $Na_2[Fe(CN)_5(NO)]$ to form a purple-coloured compound $Na_4[Fe(CN)_5(NOS)]$. In the reaction,the oxidation state of iron changes.
$(II)$ $Pt(IV)$ compounds are relatively more stable than $Ni(IV)$ compounds.
$(III)$ The welding of magnesium can be done in an atmosphere of Helium.
$(IV)$ $LiAlH_4$ on hydrolysis will give $H_2$.

Which of the following organisms live in extremely salty areas?

The given graph represents $V-I$ characteristic for a semiconductor device. Which of the following statements is correct?

$DNA$ fingerprinting involves: