Many freshwater animals cannot live for long in sea water and vice-versa mainly because of the

Do you agree that regional and local variations exist within each biome? Substantiate your answer with suitable examples.

In a sea shore,the benthic animals live in sandy,muddy and rocky substrata and accordingly developed the following adaptations:
$(a)$ Burrowing
$(b)$ Building tubes
$(c)$ Holdfasts / peduncle
Match the suitable substratum against each adaptation.

What percentage of species are included in conformers (in $\%$)?

Altitude sickness is an example of:

What is homeostasis? Define aestivation.