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...Ncert solutions for th class biology chapter biodiversity and conservation complete notes page no https www indcareer com schools exercises name the three important components of answer includes variability among life forms from all sources including land air water are a genetic diversity b species c ecosystem how do ecologists estimate total number ofspecies present in world is calculated by statistical comparison between richness well studied group insects temperate tropical regions these ratios extrapolated with other groups plants animals to calculate on earth according an researchers it about seven million which seems be variety living organism very vast give hypotheses explaining why tropicsshow greatest levels there different proposed scientists tropics i latitudes receive more solar energy than leads high productivity ii have less seasonal variations or constant environment this promotes niche specialization thus iii were subjected glaciations during ice age while remained undi...