What is Darwinian fitness?

The $ pH$  of a fertile soil is usually around

Match Column $I$ with Column $II$

and choose correct option

The species of plants that play a vital role in controlling the relative abundance of other species in a community are called

$X$ – In deep-sea hydrothermal vents where average temperature is between $25$ to $30^oC$

$Y$ – Reptiles and Amphibians are eurythermal