Ecology is basically concerned with how many basic levels of organisation?
Three
Two
Four
Eight
Study of environment and animals relation
Habitat together with functions of species constitute its
Community is
$I.$ Group of independent, interacting populations of same species
$II.$ Group of independent and interacting populations of same species in specific area
$III.$ Group of independent interacting populations of different species in a specific area
$IV.$ Group of independent and interacting populations of different species in different area
Select the correct option
Ecological hierarchy comprises, which of the following sequence
‘Eco’ term refers as