Unlike monocots, dicots have a. parallel veins in leaves. b. floral parts in multiples of three. c. fibrous roots. d. vascular bundles arranged in a ring.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

What are the four basic classes of organic molecules how do they differ structurally and functionally

The pattern of this wave changes between its beginning and end. what is true about the amplitude and wavelength of the wave when the pattern changes?