New population data provide insight on aging, migration
The European Demographic Datasheet 2016, produced by demographers at the International Institute
for Applied Systems Analysis (IIASA) and the Vienna Institute of Demography, provides a comprehensive
Tide Shifts Against the Concept of a Keystone Species
While researching starfish, Sarah Gravem has come to the conclusion that Pisaster was not
controlling the sea snail population in the same way it controlled the mussels. In 2010, her theory was
It is interbreeding between the California Tiger
Salamander, a native, endangered species, and the invasive Barred Tiger
Salamander is producing a swarm of hybrid salamanders that is larger,
more voracious, more likely to survive than either parent
The Nitrogen Cycle
1. The two organic compounds that nitrogen is found in is nucleic & amino acids.
2. The two major ways nitrogen is fixed is by biological fixation & lightning.
3. a.) Nitrogen Fixation:
Nitrogen fixation is the conversion of nitrogen ga