The density of a substance refers to how close together the molecules in that substance are packed. compare the density of water in its three phases.

The part of the eye that closes and opens to let light in is .

Which of these reproductive method is the only on available to mosses and fernsspores

Transposon can cause mutations in genes at or near the site of transposon insertion. it is possible for these elements to transpose away from their original site, causing a reversion of the mutant phenotype. in some cases, however, even more severe phenotypes appear when these elements excise from this site, due to events at or near the mutant allele. what might be happening to the transposon or the nearby gene to create more severe mutations?