The body of the ovule is fused with the funicle at:

$10 \ g$ of a radioactive element is disintegrated to $1 \ g$ in $2.303 \ \text{minutes}$. What is the half-life (in minutes) of that radioactive element?

If $a, b, c, d$ are positive real numbers such that $\frac{a}{3} = \frac{a+b}{4} = \frac{a+b+c}{5} = \frac{a+b+c+d}{6}$,then the value of $\frac{a}{b+2c+3d}$ is

Which of the following chambers of the human heart has the thickest wall?

Which one of the following characters is not typical of the class Mammalia?

Many ionic crystals dissolve in water because