10 Population Dynamics â¢â¯Metapopulations A metapopulation is a population of populations. Metapopulations Metapopulations âspatially isolated populations that are linked by the dispersal of individuals. Metapopulations are characterized by repeated extinctions and colonizations.
Osteopenia is a condition in which bone mineral density is lower than normal. It is considered by many doctors to be a precursor to osteoporosis.ike osteoporosis, osteopenia occurs more frequently in post-menopausal women as a result of the loss of estrogen. It can also be exacerbated by lifestyle factors such as lack of exercise, excess consumption of alcohol, smoking or prolonged use of glucocorticoid medications.
An ostium (plural ostia) in anatomy is a small opening or orifice.