The following illustration shows four body systems. Siobhan’s science teacher asks her to identify the two organ systems that work together to provide cells with oxygen and to remove carbon dioxide. Which two systems should Siobhan list?

system 1 and system 2
system 1 and system 4
system 2 and system 3
system 3 and system 4

How is the atomic number of a nucleus changed by alpha decay

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?

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.