Which events can occur in the nitrogen cycle? 1 Inorganic nitrogen in the atmosphere undergoes denitrification by specific prokaryotes. 2 Nitrate concentrations in the soil are increased by nitrifying bacteria in waterlogged soil. 3 Organic nitrogen in legumes passes into the soil where deamination and ammonification occurs. 4 Saprotrophic fungi living in the soil decompose organic nitrogen in faeces.

A farmer grows a different crop in a field each year for three years. In the fourth year he grows a leguminous crop, …

There is considerable variation in the ecosystems that occur in the continent of North America. These include conifer…

The red squirrel is a tree-living mammal native to woodlands in the United Kingdom. The population and distribution o…

Which features must always be present for water to move between two solutions by osmosis? 1 carrier proteins 2 cell …

When living pancreatic cells were placed in a solution of a red stain called neutral red, the cytoplasm became red. T…

DNA molecules in a eukaryotic cell must be packaged compactly because their combined length is much greater than the …