A student studying photosynthesis uses a toothpick to collect pigment from a leaf She spreads the pigment on to a strip of filter paper and drop it
into a chamber containing a solvent. As the solvent migrates up the filter
paper, the pigments from the leaf are carried up the paper with the
solvent. This process is called chromatography. The students results from
her chromatography experiment are in the image. What can the student
conclude based on the results.
Kiki

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.

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules