Ascientist is working on an experiment for which she needs 20 liters of a 3.5% salt solution, the same salinity as ocean water. all she has in her lab are a 10% salt solution and a 1% salt solution. she decides to mix these to make her own 3.5% solution. how much of the 1% solution will she need to use?

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.