What strategies can be u$lised by submerged and floating leaved macrophytes to adapt to rising water levels and a modified light climate? use vallisneria(submerged) and villarsia(floa$ng leaved as examples to describe morphological changes and how this impacts on growth rate.

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.