Which of the following hormones is not a secretory product of the human placenta?

Liquid $X$ is used in a bubble chamber to detect neutral mesons and gamma photons. Then,$X$ is

If $A=\left[\begin{array}{rr}i & -i \\ -i & i\end{array}\right]$ and $B=\left[\begin{array}{rr}1 & -1 \\ -1 & 1\end{array}\right]$,then find $A^8$. (in $B$)

The energy-releasing metabolic process in which substrate is oxidized without an external electron acceptor is called:

What is the objective of Systematics?

In the expansion of $(1+x)^n$,the coefficients of $p$-th and $(p+1)$-th terms are respectively $p$ and $q$. Then $p+q=$