Trace metals such as manganese that catalyze the formation of HMF were found to be present in all of the commercial HFCS samples that were studied by LeBlanc. How can this observation be explained?

the answer for this question would be d. glaciers

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.