pregnant women
hikers
sportsmen
farmers
The most important cardiac stimulant is
The most productive ecosystem in the biosphere is
The most serious air pollutant causing health hazard is
The movement of cell against the concentration gradient is called
The muscle which separate the right side and left side of heart is known as
The Mushrooms are rich sources of
The name of the longest muscle in human body is
The newly hatched tadpole breaths through its
The nitrogen fixing bacteria present in the root nodules of leguminous plant is
The nitrogen in the ecosystem is circulated by-
