Eurythermal animals and plants are those which

Changes in the body form of some planktonic animals with seasonal changes in temperature are grouped under

In the given graph,what does the horizontal line passing through the middle represent?

$A$ plant species shows several morphological variations in response to altitudinal gradient. When grown under similar conditions of growth,the morphological variations disappear and all the variants have common morphology. What are these variants called?

$A$ person moves from Delhi to Shimla during the hot summer days. This is an example of which of the following?

Habitat together with the functions of a species constitutes its