Paleo-ecology is referred as the study of
Living organisms with environment
Extinct organisms with their environment
Herbivores with their environment
None of these
Species which occupy a similar ecological niche in similar communities occupying different biogeographical regions are
$A$ population is
$A$ : Population ecology is a link of ecology to population genetics and evolution.
$R$ : Natural selection operates at population level to evolve the desired traits.
Smallest unit of ecology is
The niche of a population is defined as