Intraspecific Interaction within a single species . Intrinsic Rate of Increase Mathematical parameter measuring the growth of a population. Determined from birth and death rates in a population. Invertebrate Animal that does not have a backbone. Also see vertebrate .
Inversion See temperature inversion .
The emission of alpha or beta particles or gamma rays from radioisotopes . These emitted particles can dislodge one or more electrons from atoms they strike. The free electrons can form charged ions in living tissue that can react with and damage cells. Isolated System A system where there is no interactions outside its boundary layer. Such systems are common in laboratory experiments.