‘Eco’ term refers as

Smallest unit of ecology is

Species which occupy a similar ecological niche in similar communities occupying different biogeographical regions are

Ecological hierarchy comprises, which of the following sequence

Ruthless exploitation and pollution of the environment has increased the magnitude of waste materials which has disturbed the operations of all important

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