Click on a mineral with known hardness. Move the sample minerals to the mineral to scratch it. Record your
observations in the Student Guide,
MINERAL SAMPLES
MINERALS WITH
KNOWN HARDNESS
Mineral 1
Mineral 2
Gypsum
Apatite
Mineral 3
Mineral 4
Fluorite
Calcite
Mineral 5
Mineral 6
Orthoclase

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.

If water were a non polar molecule, how would its properties be different ? a.) water would be a much lighter molecule b.) water would be able to climb up inside plants c.)water would not be able to form hydrogen bonds d.) water would stick together much more strongly

Explain how the political influence of african americans leaders became weaker.