Which of the following organisms live in extremely salty areas?

Reduction in vascular tissue,mechanical tissue,and cuticle is a characteristic of ..........

In the given figure, the magnetic field at the centre will be:

In Earthworm,the dorsal wall of the intestine from the $26^{th}$ segment to the $95^{th}$ segment forms a median internal fold called:

When the gap is closed without placing any object in the screw gauge whose least count is $0.005 \ mm$,the $5^{th}$ division on its circular scale coincides with the reference line on the main scale. When a small sphere is placed,the reading on the main scale advances by $4$ divisions,whereas the circular scale reading advances by five times the corresponding reading when no object was placed. There are $200$ divisions on the circular scale. The radius of the sphere is .......... $mm$.

The function $f(x) = \log(1 + x) - \frac{2x}{2 + x}$ is increasing on