The study of ants is known as:

If $p \rightarrow (p \wedge \sim q)$ is false,then the truth values of $p$ and $q$ are respectively

The site where crossing over occurs is known as:

$MgCl_2 \cdot 6H_2O$ when heated gives

In an experiment with a beam balance,an unknown mass $m$ is balanced by two known masses of $16\,kg$ and $4\,kg$ as shown in the figure. The value of the unknown mass $m$ is ......... $kg$.

The eccentricity of the ellipse $9x^2 + 5y^2 - 18x - 20y - 16 = 0$ is: