Ecotone is
a polluted area
the bottom of a lake
a zone of transition between two communities
a zone of developing community
Biosphere is
a component in the ecosystem
composed of the plants present in the soil
life in the outer space
composed of all living organisms present on earth which interact with the physical environment
Ecological niche is
the surface area of the ocean
an ecologically adapted zone
the physical position and functional role of a species within the community
formed of all plants and animals living at the bottom of a lake
According to Allen's rule, the mammals from colder climates have
shorter ears and longer limbs
longer ears and shorter limbs
longer ears and longer limbs
shorter ears and shorter limbs
Salt concentration (salinity) of the sea measured in parts per thousand is
$10-15$
$30-70$
$0-5$
$30-35$