Which organ receives only oxygenated blood?

The reading of the ammeter in the circuit shown will be: (in $A$)

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

Which of the following contains both polar and non-polar covalent bonds?

Find the equivalent capacitance across $A$ and $B$ in $\mu F$.

$A$ large open tank has two holes in the wall. One is a square hole of side $L$ at a depth $y$ from the top and the other is a circular hole of radius $R$ at a depth $4y$ from the top. When the tank is completely filled with water,the quantities of water flowing out per second from the two holes are the same. Then the value of $R$ is