What does it mean when a species becomes extinct? What are the main causes of extinction?
A species becomes extinct when there is no more population of that species on Earth. While extinction can be a purely natural event, the main causes of extinction today are the destruction (change) of habitat by man, followed by hunting by man. 38. What happens to an existing, stable food web if one species, which is both prey and predator of several other species in the food web, is removed? If the removed species is the only prey of one species, that species will either need to migrate to find another food source or die off. If the removed species is one of several different prey for a species, that species will just eat more of other prey. 39. Draw and label a flow map of the nitrogen cycle. SHAPE \* MERGEFORMAT Nitrogen (N2) in atmosphere (78%) Nitrogen Fixing Bacteria in Soil and Plants covert N2 to NO3 (Nitrates) Plants use NO3 as Nutrient to Grow Animals eat Plants, get NO3 Plants and Animals Die, and Decomposers Return NO3 and N2 to Soil and Air 40. Draw and label a flow map of
