How do buffers work in the human body?

they can prevent a deadly change in blood ph

they can keep blood below ph 7.0.

they can keep blood at a ph of 7.0.

they can keep blood ph perfectly neutral

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.